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Qi J, Liang B, Bao W, Jia Y, Hama N, Czekala NM, Harvey NC. 1996. The hormone change in the urine of female snub-nosed monkeys. Acta Theriologica Sinica 15(2):106-112.

Radcliffe CW, Chiszar DA. 1980. A descriptive analysis of predatory behavior in the yellow lipped sea krait (Laticauda colubrina). Journal of Herpetology 14(4):422-424. [PDF]

Radcliffe CW, Chiszar D, Estep K, Murphy JB, Smith HM. 1986. Observations on pedal luring and pedal movements in Leptodactylid frogs. Journal of Herpetology 20(3):300-306. [PDF]

Radcliffe CW, Chiszar D, O'Connell B. 1980. Effects of prey size on poststrike behavior in rattlesnakes (Crotalus durissus, C. enyo, and C. viridis). Bulletin of the Psychonomic Society 16(6):449-450. [PDF]

Radcliffe CW, Estep K, Boyer T, Chiszar D. 1986. Stimulus control of predatory behavior in red spitting cobras (Naja mossambica pallida) and prairie rattlesnakes (Crotalus v. viridis). Animal Behavior 34:804-814. [PDF]

Radcliffe CW, Murphy JB. 1984. Precopulatory and related behaviours in captive crotalids and other reptiles: suggestions for future investigation. International Zoo Yearbook 23:163-166. [PDF]

Radcliffe CW, Poole T, Feiler F, Warnoch N, Byers T, Radcliffe A, Chiszar D. 1983. Immobilization of mice following envenomation by cobras (Naja mossambica pallida). Bulletin of the Psychonomic Society 21(3):243-246. [PDF]

Radcliffe RW, Czekala NM, Osofsky SA. 1997. Combined serial ultrasonography and fecal progestin analysis for reproductive evaluation of the female white rhinoceros (Ceratotherium simum simum): preliminary results. Zoo Biology 16:445-456. [PDF]

Radcliffe RW, Eyers AI, Patton ML, Czekala NM, Emslie RH. 2001. Ultrasonographic characterization of ovarian events and fetal gestational parameters in two southern black rhinoceros (Diceros bicornis minor) and correlation to fecal progesterone. Theriogenology 55(5):1033-49.

Ralls K, Ballou JD, Rideout BA, Frankham R. 2000. Genetic management of chondrodystrophy in California Condors. Animal Conservation 3:145-153. [PDF]

Ramsay EC, Daniel GB, Tryon BW, Merryman JI, Morris PJ, Bemis DA. 2002. Osteomyelitis associated with Salmonella Enterica SS arizonae in a colony of ridgenose rattlensnakes (Crotalus willardi). Journal of Zoo and Wildlife Medicine 33(4):301-310. [PDF]

Ramsay EC, Kasman L, Lasley BL. 1985. Urinary steroid evaluations for monitoring ovarian function in Indian and Black rhinoceros. In: Proceedings of the American Association of Zoo Veterinarians Annual Conference; 1985. p. 1. [PDF]

Ramsay EC, Kasman LH, Lasley BL. 1987. Urinary steroid evaluations to monitor ovarian function in exotic ungulates: V. Estrogen and pregnanediol-3-glucoronide excretion in the black rhinoceros (Diceros bicornis). Zoo Biology 6(4):275-282.

Ramsay EC, Lasley BL, Stabenfeldt GH. 1981. Monitoring the estrous cycle of the Asian elephant (Elaphas maximus), using urinary estrogens. American Journal of Veterinary Research 42(2):256-260. [PDF]

Ramsay EC, Leach MW, Czekala N. 1989. Postmortem reproductive findings in a female Asian elephant. In: Olsen JH, Eisenacher M, editors. American Association of Zoo Veterinarians Proceedings; 1989 Oct 14-19; Greensboro (NC). p. 55. [PDF]

Ramsay EC, Montali RJ, Worley M, Stephensen CB, Holmes KV. 1989. Callitrichid hepatitis: epizootiology of a fatal hepatitis in zoo tamarins and marmosets. Journal of Zoo and Wildlife Medicine 20(2):178-183. [PDF]

Ramsay EC, Moran F, Roser JF, Lasley BL. 1994. Urinary steroid evaluations to monitor ovarian function in exotic ungulates: X. Pregnancy diagnosis in Perissodactyla. Zoo Biology 13(2):129-147.

Raudsepp T, Houck ML, O'Brien PC, Ferguson-Smith MA, Ryder OA, Chowdhary BP. 2002. Cytogenetic analysis of California condor (Gymnogyps californianus) chromosomes: comparison with chicken (Gallus gallus) macrochromosomes. Cytogenetic and Genome Research: 98(1):54-60. [PDF]

Ray DA, Xing J, Hedges DJ, Hall MA, Laborde ME, Anders BA, White BR, Stoilova N, Fowlkes JD, Landry KE, Chemnick LG, Ryder OA, Batzer MA. 2005. Alu insertion loci and platyrrhine primate phylogeny. Molecular Phylogenetics and Evolution. 35(1):117-26. [PDF]

Recharte M, Bride IG, Bowler M. 2015. A recovering flagship: giant otters, communities and tourism in northern Peru. Wildlife Research. 41(6):490-498.

Reddy M, Kamolnick T, Curry C, Skaar D, Ridgway S. 1994. Energy requirements for the bottlenose dolphin, Tursiops truncatus, in relation to sex, age, and reproductive status. Marine mammals: public display and research 1:26-31. [PDF]

Reeder AL, Ruiz MO, Pessier A, Brown LE, Levengood JM, Phillips CA, Wheeler MB, Warner RE, Beasley VR. 2005. Intersexuality and the cricket frog decline: historic and geographic trends. Environmental Health Perspectives 113(3):261-265. [PDF]

Reeder NMM, Pessier AP, Vredenburg VT. 2012. A reservoir species for the emerging amphibian pathogen Batrachochytrium dendrobatidis thrives in a landscape decimated by disease. PLoS ONE 7(3):e33567. DOI:10.1371/journal.pone.0033567 [PDF]

Reese R. 1987. The emerging organization: its possibilities for zoos and their leaders. In: AAZPA Regional Proceedings; 1987. p. 389-391. [PDF]

Reichard TA, Ensley PK, Hendrick MJ. 1982. Pheochromocytoma in a ring-tailed lemur (Lemur catta). In: American Association of Zoo Veterinarians Annual Proceedings; 1982 Aug; Seattle (WA). p. 44-45. [PDF]

Reichard TA, Favata GF, Petiniot C, Gheres A, Czekala NM, Lasley BL. 1990. Reproductive management plan of Toledo Zoo lowland gorillas over the past 25 years. Zoo Biology 9:149-156. [PDF]

Reichard TA, Robinson PT, Ensley PK, Meier JE, Van Winkle T. 1981. Pancreatitis in a cheetah (Acinonyx jubatus). In: American Association of Zoo Veterinarians Annual Proceedings; 1981. p. 78-80. [PDF]

Reichard TA, Ullrey DA, Robinson PT. 1982. Nutritional implications of dental problems in elephants. In: American Association of Zoo Veterinarians Annual Conference Proceedings; 1982. p. 73-75. [PDF]

Reiten AC, Jensen R, Griner LA. 1966. Eosinophilic myositis (Sarcosporidiosis; Sarco) in beef cattle. American Journal of Veterinary Research 27(119):903-906. [PDF]

Resnick R, Robinson PT, Lasley B, Benirschke K. 1978. Intrauterine fetal demise associated with consumption coagulopathy in a Douc langur monkey (Pygathrix nemaeus nemaeus). Journal of Medical Primatology 7:249-253. [PDF]

Reynolds RG, Gerber GP. 2012. Ecology and conservation of the Turks Island boa (Epicrates chrysogaster chrysogaster: Squamata: Boidae) on Big Ambergris Cay. Journal of Herpetology 46(4):578-586. doi:10.1670/11-079

Reynolds RG, Gerber GP, Fitzpatrick BM. 2011. Unexpected shallow genetic divergence in Turks Island boas (Epicrates c. chrysogaster) reveals single evolutionarily significant unit for conservation. Herpetologica 67: 477-486. [PDF]

Rice NR, Simek S, Ryder OA, Coggins L. 1978. Detection of proviral DNA in horse cells infected with equine infectious anemia virus. Journal of Virology 26(3):577-583. [PDF]

Rich MS. 1976. Financial aspects of international zoological transactions. In: AAZPA National Conference Proceedings; 1976. p. 210-211. [PDF]

Rich MS. 1982. Benefits of curatorial fieldwork in natural ecosystems. ASC Newsletter: 17-18. [PDF]

Richter AG, Olsen J, Fletcher K, Benirschke K, Bogart M. 1977. Techniques for collecting blood from Galapagos tortoises and box turtles. Veterinary Medicine/Small Animal Clinician 72(8):1376-1378. [PDF]

Rideout BA. 2005. Trying to find out "why": pathology at the Zoological Society of San Diego. Zoonooz 78(10):20-23.

Rideout BA. 2006. In memoriam: Dr. Lynn Griner. Zoonooz 79:20-21.

Rideout BA. 2006. Leading the way at CRES: Dr. Allison Alberts. Zoonooz 79:8-9.

Rideout BA. 2012. Causes of abortion in nondomestic mammals. In: Njaa B, ed. Kirkbride's laboratory diagnosis of animal abortion, 4th ed. Sussex: Wiley-Blackwell. p. 201-220. [PDF]

Rideout BA, Gardiner CH, Zuba JR, Stalis IH, Hadfield T, Visvesvara GS. 1997. Fatal infections with Balamuthia mandrillaris (a free-living amoeba) in gorillas and other Old World primates. Veterinary Pathology 34(1):15-22. [PDF]

Rideout BA, Gause GE, Benirschke K, Lasley BL. 1985. Stress-induced adrenal changes and their relation to reproductive failure in captive Nine-banded armadillos (Dasypus novemcinctus). Zoo Biology 4:129-137. [PDF]

Rideout BA, Lowenstine LJ, Hutson CA, Moore PF, Pedersen NC. 1992. Characterization of morphologic changes and lymphocyte subset distribution in lymph nodes from cats with natural feline immunodeficiency virus infection. Veterinary Pathology 29(5):391-399. [PDF]

Rideout BA, Moore PF, Pedersen NC. 1992. Persistent upregulation of MHC class II antigen expression on T lymphocytes from cats experimentally infected with feline immunodeficiency virus. Veterinary Immunology Immunopathology 35(1-2):71-81.

Rideout BA, Rotstein D, Oaks JL, Sandfort C, Hall C, Richman L, Scott DP, Garber R, Stalis I, Jenny JP. 1997. An adenovirus outbreak causing high morbidity and mortality in captive aplomado falcons (Falco femoralis septentrionalis). In: Proceedings AAZV Annual Conference; 1997 Oct 26-30; Houston (TX). p. 45-46.

Rideout BA, Stalis I, Papendick R, Pessier A, Puschner B, Finkelstien ME, Smith DR, Johnson M, Mace M, Stroud R, Brandt J, Burnett J, Parish C, Petterson J, Witte C, Stringfield C, Orr K, Zuba J, Wallace M, Grantham J. 2012. Patterns of mortality in free-ranging California condors (Gymnogyps californianus). Journal of Wildlife Diseases 48(1):95-112. [PDF]

Rideout BA, Worley MB, Anderson MP, Jacobson ER. 1993. Alimentary tract lymphomas in Galapagos tortoises. In: Proceedings of AAZV Annual Conference; 1993. p. 222-223.

Rieches R. 1999. A keeper's guide to the introduction and management of the Indian, Black, and White Rhinoceros. In: Proceedings of the First Rhino Keepers' workshop 1999, sponsored by Disney's Animal Kingdom. [PDF].

Rimlinger D. 1981. The Gang-Gang. Zoonooz 54(3):5-7.

Rimlinger D. 1982. High rise living: for the birds. Zoonooz 55(3):10-11.

Rimlinger D. 1982. Spring courtship. Zoonooz 55(5):4-8.

Rimlinger D. 1984. The Empress of Germany's Bird of Paradise. Zoonooz 57(2):10-14.

Rimlinger DS. 1985. Observations on the display behaviour of the Bulwer's pheasant. World Pheasant Association Journal 10:15-26. [PDF]

Rimlinger D, Azua J, Lewins E. 1997. Observations on the Breeding and Hand-rearing of the Empress of Germany's Bird of Paradise Paradisaea raggiana augustaevictoriae. Der Zoologische Garten 67 (1-2):S71-80.

Rimlinger DS, Bland J, Wen X, Xiaojun Y. 2001. Surveys for Sclater's monal in northwestern Yunnan. TRAGOPAN 13/14:16-19. [PDF]

Rimlinger DS, Johnsgard PA. 1983. Display behavior of Temminck's tragopan. World Pheasant Association Journal 9:19-32. [PDF]

Rimlinger DS, Landel H, Yun CC, Geng G. 2000. Natural History of a marked population of Chinese monals Lophophorus lhuysii in Sichuan Province, China. In: Proceedings of the 2nd International Galliformes Symposium; 2000; Nepal. p. 174-182. [PDF]

Rimlinger DS, Lewins E, King P. 2000. A breeding history of the Collared lorikeet and Blue-crowned lorikeet Phigys solitarius and Vini australis at San Diego Zoo and Assiniboine Park Zoo Winnipeg. International Zoo Yearbook 37(1):58-61.

Rimlinger DS, Witman P. 1986. Observations on the Breeding and Behavior of the Chinese monal in Captivity. In: Proceedings of the Third International Symposium on Pheasants; 1986; Thailand.

Risser AC Jr. n.d. Potential for stimulating reproduction in captive birds by photoperiod manipulation. 9 p. [PDF]

Risser AC Jr. 1971. A technique for performing laparotomy on small birds. Condor 73(3):376-379. [PDF]

Risser AC Jr. 1975. Avian quarantine problems: decision from dilemma. In: AAZPA Regional Conference Proceedings; 1975. p. 279-285. [PDF]

Risser AC Jr. 1975. Experimental modification of reproductive performance by density in captive starlings. Condor 77(2):125-132. [PDF]

Risser AC Jr. 1980. Bird propagation -- is there a limit? In: AAZPA Annual Conference Proceedings; 1980. p. 17-21. [PDF]

Risser AC Jr. 1980. Thick-billed parrots. AFA Watchbird 7(1):10-12. [PDF]

Risser AC Jr. 1981. The future of zoo bird breeding programs. In: AAZPA Annual Conference Proceedings; 1981. p. 115-123. [PDF]

Risser AC Jr, Toone W, Sterner D, Jones D, Usnik B. 1983. Hand-raising the California condor. In: AAZPA Annual Conference Proceedings; 1983. p. 244-249. [PDF]

Rivas AD, Pye GW, Papendick R. 2014. Dermal hemangiosarcoma in a sugar glider (Petaurus breviceps). Journal of Exotic Pet Medicine 23(4):384-388. doi:10.1053/j.jepm.2014.07.001

Robbins MM, Czekala NM. 1997. A preliminary investigation of urinary testosterone and cortisol levels in wild male mountain gorillas. American Journal of Primatology 43:51-64. [PDF]

Robbins PK, Pye GW, Sutherland-Smith M, Papendick R, Greenberg M, Levy D, Madani M. 2009. Successful transabdominal subxiphoid pericardiostomy to relieve chronic pericardial effusion in a Sumatran orangutan (Pongo abelli). Journal of Zoo & Wildlife Medicine 40(3):564-567. [PDF]

Robeck TR, Schneyer AL, McBain JF, Dalton LM, Walsh MT, Czekala NM, Kraemer DC. 1993. Analysis of urinary immunoreactive steroid metabolites and gonadotropins for characterization of the estrous cycle breeding period and seasonal estrous activity of captive killer whales (Orcinus orca). Zoo Biology 12(2):173-187. doi:10.1002/zoo.1430120204

Robertson GJ, Owen MA, Rockwell RF. 1995. Responses of snow geese to artifically induced hatching asynchrony and increased clutch size. Auk 112(3):790-794. [PDF]

Robertson IM. 1986. Development of browse facilities and programs for zoos -- a case study of San Diego Zoo and Wild Animal Park. In: AAZPA Regional Proceedings; 1986. p. 285-304. [PDF]

Robinson MM. 1986. Spotlight on Ernest Schwarz Library of the Zoological Society of San Diego. Biofeedback 12(3):10-11. [PDF]

Robinson MM. 1987. Ernst Schwarz Library Zoological Society of San Diego. Special Libraries Association San Diego Bulletin 27(2). [PDF]

Robinson MM. 1987. Library profile. Sci-Tech News: 52-54. [PDF]

Robinson MM. 1988. Zoological Society of San Diego Library. Science and Technology Libraries 8(4):33-38. [PDF]

Robinson PT. n.d. Wildlife survey of the proposed Lofa-Mano River National Park in Liberia West Africa [proposal]. 18 p. [PDF]

Robinson PT. 1969. No. 204. Pygmy Hippopotamus -- ecological survey in West Africa. In Vollmar F, ed. World Wildlife Fund yearbook. p. 123-125. [PDF]

Robinson PT. 1971. A history of the pigmy hippo in captivity. Journal of Zoo Animal Medicine 2(2):24. [PDF]

Robinson PT. 1971. Wildlife trends in Liberia and Sierra Leone. Oryx 11(2/3):117-122. [PDF]

Robinson PT. 1974. Multiple canine teeth fistulae in a Red Uakari monkey. Veterinary Medicine/Small Animal Clinician: 699. [PDF]

Robinson PT. 1975. The application of modern medical technology to zoo animal health. In: AAZPA Regional Conference Proceedings; 1975. p. 295-301. [PDF]

Robinson PT. 1975. Unilateral patagiectomy: a technique for deflighting large birds. Veterinary Medicine/Small Animal Clinician: 143-145. [PDF]

Robinson PT. 1976. Immobilization of Felidae with M99. Journal of Zoo Aniaml Medicine 7(2):31. [PDF]

Robinson PT. 1977. Intrauterine death. In: American Association of Zoo Veterinarians Annual Proceedings; 1977; Honolulu (HI). p. 114-117. [PDF]

Robinson PT. 1977. Special techniques in reptile medicine. In: American Association of Zoo Veterinarians Annual Proceedings; 1977; Honolulu. p. 68-70. [PDF]

Robinson PT. 1978. Post-graduate training in zoological medicine. Journal of Zoo Animal Medicine 9:29-31. [PDF]

Robinson PT. 1979. Increased use of phencyclidine by humans -- a clinical note. Journal of Zoo Animal Medicine 10:91. [PDF]

Robinson PT. 1979. The keeper's role in the successful treatment and movement of animals. Animal Keepers' Forum 6:212-214. [PDF]

Robinson PT. 1979. A literature review of dental pathology and aging by dental means in nondomestic animals -- part I. Journal of Zoo Animal Medicine 10:57-65. [PDF]

Robinson PT. 1979. A literature review of dental pathology and aging by dental means in nondomestic animals -- part II. Journal of Zoo Animal Medicine 10:81-91. [PDF]

Robinson PT. 1979. Oral pathology in mammals at the San Diego Zoo and Wild Animal Park. In: American Association of Zoo Veterinarians Annual Proceedings; 1979 Oct; Denver (CO). p. 96-98. [PDF]

Robinson PT. 1979. Searching for Nimwe: the elusive Pigmy hippopotamus. Zoonooz 52(1):7-12. [PDF]

Robinson PT. 1979. Surgical removal of impacted molar teeth in an orangutan. Journal of the American Veterinary Medical Association 175(9):1000-1001. [PDF]

Robinson PT. 1979. Intestinal anastomosis for correction of prolapsed colon in an emu. Journal of Zoo Animal Medicine 10:124-126. [PDF]

Robinson PT. 1980. A summary of consultant activities in Liberia: Wildlife conservation and a preliminary investigation of the proposed Sarpo National Park [report]. 29 p. [PDF]

Robinson PT. 1981. The reported use of denning structures by the pygmy hippopotamus Choeropsis liberiensis. Mammalia 45(4):506-508. [PDF]

Robinson PT. 1981. A review of thirty-three Queenlsand koala (Phascolarctos cinereus) immobilization procedures. Journal of Zoo Animal Medicine 12:121-123. [PDF]

Robinson PT. 1982. Design features of veterinary services. In: Susman K, ed. Zoological park and aquarium fundamentals. Wheeling (WV): AAZPA. p. 47-53. [PDF]

Robinson PT. 1982. Operating procedures for veterinary medical services. In: Susman K, ed. Zoological park and aquarium fundamentals. Wheeling (WV): AAZPA. p. 223-240. [PDF]

Robinson PT. 1982. The proposed Sarpo National Park in Liberia -- a field study of prospects and problems [report]. 51 p. [PDF]

Robinson PT. 1983. Dental radiography techniques. In: American Association of Zoo Veterinarians Annual Conference Proceedings; 1983. p. 5-9.

Robinson PT. 1983. The use of ketamine in restraint of a black-bellied pangolin (Manis tetradactyla). Journal of Zoo Animal Medicine 14:19-23. [PDF]

-[PDF] Robinson PT. 1985. The proposed Sarpo National Park in Liberia: a field survey of prospects and problems. National Geographic Society Research Reports 21:425-435. [PDF]

Robinson PT. 1987. The collaboration of the keeper and veterinarian in the chemical restraint of great apes by hand syringe injection. Animal Keepers' Forum 14(4):116-117. [PDF]

Robinson PT, Benirschke K. 1980. Congestive heart failure and nephritis in an adult gorilla. Journal of the American Veterinary Medical Association 177(9):937-938. [PDF]

Robinson PT, Benirschke K. 1981. Removal of a conjunctival dermoid in an African lion (Panthera leo). Journal of Zoo Animal Medicine 12:85-88. [PDF]

Robinson PT, Birch L, Washino RK. 1975. Hemoglobin crystals: unexpected beauty. Zoonooz 48(9):4-11. [PDF]

Robinson PT, Bush M. 1981. Clinical and pathologic aspects of pulmonary acariasis in Douc langur and Proboscis monkeys. Der Zoologische Garten 51(3/4):161-169. [PDF]

Robinson PT, Buzikowski R. 1975. Pinioning young birds with hemostatic clips. Veterinary Medicine/Small Animal Clinician: 1415-1417. [PDF]

Robinson PT, Fairfield J. 1984. Immobilization of an ostrich with ketamine HCl. Journal of Zoo Animal Medicine 5(4):11. [PDF]

Robinson PT, Janssen DL. 1980. Iatrogenic anesthetic emergencies in nondomestic animals: three case reports. Journal of the American Animal Hospital Association 16:279-282. [PDF]

Robinson PT, Lambert D. 1986. A review of 226 chemical restraint procedures in great apes at the San Diego Zoo [abstract]. In: American Association of Zoo Veterinarians Annual Conference Proceedings; 1986 Nov 2-6; Chicago (IL). p. 183. [PDF]

Robinson PT, Meier JE. 1977. Surgical removal of a tumor from an Asian elephant. Veterinary Medicine/Small Animal Clinician: 1638-1640. [PDF]

Robinson PT, Oosterhuis J E. 1974. Dystocia metritis and toxemia in an African lion. Journal of the American Veterinary Medical Association 165(1):828.

Robinson PT, Reichard TA, Whetter PA, Ullrey DE. 1982. Evaluation of diets of leaf-eating monkeys -- langurs [abstract]. In: American Association of Zoo Veterinarians Annual Conference Proceedings; 1982. p. 36. [PDF]

Robinson PT, Richter AG. 1977. A preliminary report on the toxicity and efficacy of levamisole phosphate in zoo birds. Journal of Zoo Animal Medicine 8(1):23-26. [PDF]

Robinson PT, Sedgwick CJ. 1973. Immobilization of a polar bear (Thalarctos maritimus) with ketamine HCl. Journal of Zoo Animal Medicine 4(3):27-28. [PDF]

Robinson PT, Sedgwick C J. 1975. Zoo surgery challenges clinicians. AORN Journal 21(4):671-688. [PDF]

Robinson PT, Sedgwick CJ. 1984. Traumatic evisceration in an oribi antelope (Ourebia ourebi). Journal of Zoo Animal Medicine 5(4):26. [PDF]

Robinson PT, Sedgwick CJ, Lochner FK. 1975. Vasectomy: solution to the overpopulation problem in captive African lions?. Veterinary Medicine/Small Animal Clinician: 1353-1356. [PDF]

Robinson PT, Sedgwick CJ, Meier JE, Bacon JP. 1978. Internal fixation of a humeral fracture in a Komodo dragon lizard (Varanus komodensis). Veterinary Medicine/Small Animal Clinician: 645-649. [PDF]

Robinson PT, von Essen CF, Benirschke K, Meier JE, Bacon JP Jr. 1978. Radiation therapy for treatment of an intraoral malignant lymphoma in an Indian rock python. Journal of the American Veterinary Radiology Society 19(3):92-95. [PDF]

Robles-Sikisaka R, Rivera R, Nollens HN, St. Leger J, Burchell J, et al. 2012. Evidence of recombination and positive selection in cetacean papillomaviruses. Virology 427(2):189-197. doi:10.1016/j.virol.2012.01.039

Rodriguez CE, Pessier AP. 2014. Pathologic changes associated with suspected hypovitaminosis A in amphibians under managed care. Zoo Biology 33(6):508-515. doi:10.1002/zoo.21161

Rodriguez YA, Durrant BS. 1991. Description of the North American scimitar-horned oryx population by analysis of studbook and necropsy reports. In: AAZPA Annual Conference Proceedings; 1991. p. 641.

Roe M, McDonald N, Durrant B, Jensen T. 2013. Xenogeneic transfer of adult quail (Coturnix coturnix) spermatogonial stem cells to embryonic chicken (Gallus gallus) hosts: a model for avian conservation. Biology of Reproduction 88(5): Article 129, 1-7. doi:10.1095/biolreprod.112.105189 [PDF]

Roever CL, Beyer HL, Chase MJ, van Aarde RJ. 2014. The pitfalls of ignoring behaviour when quantifying habitat selection. Diversity and Distributions 20(3):322-333. doi:10.1111/ddi.12164 [PDF]

Roever CL, van Aarde RJ, Chase MJ. 2013. Incorporating mortality into habitat selection to identify secure and risky habitats for savannah elephants. Biological Conservation 164: 98-106. doi:10.1016/j.biocon.2013.04.006

Rogers DL, Qualset CO, McGuare PE, Ryder OA. 2009. The silent biodiversity crisis: loss of genetic resource collections. In: Amato G, DeSalle R, Rosenbaum HC, Ryder OA, eds. Conservation Genetics in the Age of Genomics. New York: Columbia University Press. p141-159. [PDF]

Romanov MN, Dodgson JB. 2006. Cross-species overgo hybridization and comparative physical mapping within avian genomes. Animal Genetics 37(4):397-399. [PDF]

Romanov MN, Koriabine M, Nefedov M, de Jong PJ, Ryder OA. 2006. Construction of a California condor BAC library and first-generation chicken-condor comparative physical map as an endangered species conservation genomics resource. Genomics 88:711-718. [PDF]

Romanov MN, Tuttle EM, Houck ML, Modi WS, Chemnick LG, Korody ML, Stremel Mork EM, Otten CA, Renner T, Jones KC, Dandekar S, Papp ED, Magrini V, Hickenbotham MT, Glasscock J, McGrath S, Mardis ER, Ryder OA. 2009. The value of avian genomics to the conservation of wildlife [proceedings]. BMC Genomics 10(Suppl2):S10. doi:10.1186/1471-2164-10-S2-S10 [PDF]

Roocroft A. 1985. Skin care in elephants. Animal Keepers' Forum: 347-349. [PDF]

Roocroft A. 1986. Controlled public feeding as a form of occupational therapy in Asian elephants at the San Diego Wild Animal Park. Animal Keepers' Forum 13:187-188. [PDF]

Rose RW, Nevison CM, Dixson AF. 1997. Testes weight, body weight and mating systems in marsupials and monotremes. Journal of Zoology 243(3):523-531. doi:10.1111/j.1469-7998.1997.tb02798.x

Rostal DC, Grumbles JS, Lance VA, Spotila JR. 1994. Non-lethal sexing techniques for hatchling and immature desert tortoises (Gopherus agassizii). Herpetological Monographs 8:83-87. [PDF]

Rostal DC, Grumbles JS, Palmer KS, Lance VA, Spotila JR, Paladino FV. 2001. Changes in gonadal and adrenal steroid levels in the leatherback sea turtle (Dermochelys coriacea) during the nesting cycle. General and Comparative Endocrinology 122:139-147. [PDF]

Rostal DC, Lance VA, Alberts AC. 1992. Seasonal reproductive cycles of the desert tortoise in the Las Vegas Valley [abstract]. American Zoologist 32(5):27A. [PDF]

Rostal DC, Lance VA, Grumbles JS, Alberts AC. 1994. Seasonal reproductive cycle of the desert tortoise (Gopherus agassizii) in the Eastern Mojave Desert. Herpetological Monographs 8:72-82. [PDF]

Rostal DC, Lance VA, Grumbles JS, Schumacher I. 1994. Reproduction in the desert tortoise: effects of upper respiratory tract disease [abstract]. American Zoologist 34(5):22A. [PDF]

Rostal DC, Wibbels T, Grumbles JS, Lance VA, Spotila JR. 2001. Chronology of sex determination in the desert tortoise (Gopherus agassizii). Chelonian Conservation and Biology 4:313-318.

Roth T, Patton L, Brown J, Czekala NM, Swaisgood R, Lance V. 1998. The North American experience: female hormonal cycles in southern white rhinoceros. In: Patton L, Czekala NM, Lance V, edtors. Workshop on Problems Associated with the Low Rate of Reproduction among Captive-born Female Southern White Rhinoceros (Ceratotherium simum simum); 1998; San Diego (CA). p. 6-8.

Rothwell ES, Bercovitch FB, Andrews JRM, Anderson MJ. 2010. Estimating daily walking distance of captive African elephants using an accelerometer. Zoo Biology 29:1-13. [PDF]

Rothwell ES, Bercovitch FB, Andrews JRM, Anderson MJ. 2011. Estimating daily walking distance of captive African elephants using an accelerometer. Zoo Biology 30(5):579-591. doi:10.1002/zoo.20364

Roever CL, van Aarde RJ, Chase MJ. 2013. Incorporating mortality into habitat selection to identify secure and risky habitats for savannah elephants. Biological Conservation 164: 98-106. doi:10.1016/j.biocon.2013.04.006 [PDF]

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Ryder OA. 1985. The last of the wild horses [book review]. Animal Kingdom 88:8.

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Ryder OA. 1986. The collection of samples for genetic analysis: principles, protocols and pragmatism. In: Benirschke K, ed. Primates: the road to self-sustaining Populations. New York: Springer Verlag. pp. 1033-1036.

Ryder OA. 1986. Genetic analysis of Przewalski’s horses in captivity. In: The Przewalski’s horse and restoration to its natural habitat in Mongolia. Rome: FAO. p. 43-66.

Ryder OA. 1986. Genetic investigations: tools for supporting breeding programme goals. International Zoo Yearbook 24/25:157-162. [PDF]

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Ryder OA. 1987. Biochemical investigations of rhino systematics. Pachyderm 9(6):5-6.

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Ryder OA. 1988. Przewalski’s horse: putting the wild horse back in the wild. Oryx 22(3):154-157.

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Ryder OA. 1989. Genetic studies in support of conservation of gorillas. In: International Union of Directors of Zoological Gardens, Scientific Session of the 44th Annual Conference, San Antonio, TX: pp. 54-58.

Ryder OA. 1989. International Studbook for the Malayan Tapir, Tapirus indicus. San Diego: Zoological Society of San Diego.

Ryder OA. 1989. Recent advances in the applications of research in the genetics of small populations to the conservation of species in zoological parks. In: Spitsin V, ed. Achievements of zoos in breeding rare and endangered species of animals. Moscow: Ministry of Culture of USSR. p. 55-60.

Ryder OA. 1989. Review of Reproduction and disease in captive and wild animals, Vol. 60. Trends in Ecology and Evolution 4(10):313.

Ryder OA. 1989. Species Survival Plan report--Asian wild horse. AAZPA Newsletter 30(8):9-10.

Ryder OA. 1990. Goals of Przewalski's horse breeding. In: 5th International Symposium on the Preservation of the Przewalski Horse; 1990; Leipzig Zoo. p. 105-106. [PDF]

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Ryder OA. 1990. A wildlife genetics laboratory in Kenya. ZooNooz 63(9):5-9.

Ryder OA. 1991. Asian wild horse SSP report. In: AAZPA annual report on conservation and science. p. 113-115.

Ryder OA. 1991. Back in the USSR. Notes on Przewalski’s horses. ZooNooz 64(12):6-11.

Ryder OA. 1991. International cooperation in species preservation: the Przewalski’s Horse Reintroduction Program. In: Annual Proceedings of the American Association of Zoological Parks and Aquariums; 1991; Silver Spring (MD): AAZA. p. 391-395.

Ryder OA. 1991. International Rhino Conference Report: Summary of the First International Conference on the Biology and conservation of the Five Extant Species of Rhinoceros. San Diego.

Ryder OA. 1992. Asian wild horse SSP report. In: AAZPA annual report on conservation and science. p. 132-133.

Ryder OA. 1992. DNA investigative technologies: application to endangered species preservation. Clinical Chemistry 38:458-459. [PDF]

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Noble SJ, Ryder OA. 1993. Perinatal mortality in rhinos. In: Proceedings of an International Conference Rhinocerous Biology and Conservation; 1993; San Diego (CA). p. 367-368.

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Ryder OA. 1994. Ex situ conservation and the conservation role of zoological parks and aquariums. In: Meffe GK, Carroll CR, eds. Principles of conservation biology. Sunderland (MA): Sinauer Associates. p. 175-178.

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Ryder OA. 1994. A horse of a different chromosome?. Natural History 103(1):54.

Ryder OA. 1995. Molecular evolution and conservation relevance of snub-nosed langurs. In: Primate Research and Conservation; Proceedings of the Second China Primate Conference; 1995.

Ryder OA. 1995. Panda paternity: the DNA evidence. ZooNooz 68(7):14-15.

Ryder OA. 1995. Re-introduction of wild horses in Mongolia. Reintroduction News 10:11-12.

Ryder OA. 1995. Zoological parks and the conservation of biological diversity: linking ex situ and in situ conservation efforts. Journal of Environment and Development 4:105-120. [PDF]

Ryder OA. 1997. Gorilla taxonomy. In: Ogden J, Wharton D, eds. The management of gorillas in captivity. Gorilla Species Survival Plan and Atlanta/Fulton County Zoo. p. 7-9. [PDF]

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Ryder OA. 2000. Genome evolution in Artiodactyla and its relevance to conservation. In: Vrba ES, Schaller GB, eds. Antelopes, deer, and relatives: fossil record, behavioral ecology, systematics, and conservation. New Haven (CT): Yale University Press. p. 295-301.

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Ryder OA. 2002. Cloning advances and challenges for conservation. Trends in Biotechnology 20(6):231-232. [PDF]

Ryder OA. 2002. From paternity to populations: assessing genetic variation contributes to conservation. ZooNooz 75(10): 8-9.

Ryder OA. 2002. An introductory perspective: gorilla systematics, taxonomy and conservation in the era of genomics. In: Taylor A, Goldsmith M, eds. Gorilla biology. Cambridge: Cambridge University Press. p.8: 239-246.

Ryder OA. 2003. Genetic studies in zoological parks and their application to conservation: past, present and future. International Zoo Yearbook 38(1):102-111.

Ryder OA. 2005. Conservation genomics: applying whole genome studies to species conservation efforts. Cytogenetic and Genome Research 108(1-3):6-15. [PDF]

Ryder OA. 2009. Forests of the night: refugia of genetic diversity in wild tigers. PLoS Genetics 5(8):e1000603. [PDF]

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Ryder OA. 2012. The Frozen Zoo. GeneWatch 35:19-20. [PDF]

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Ryder OA, Ballou J, Dolan JM, Foose TJ, Reindl NJ, Thompson EA, Wemmer CM. 1989. Asian Wild Horse Species Survival Plan: Masterplan 1989. San Diego (CA): Zoological Society of San Diego. 69 p.

Ryder OA, Benirschke K. 1983. The value of frozen tissue collections for zoological parks. Collections of Frozen Tissues -- Value Management Field and Laboratory Procedures and Directory of Existing Collections. A Report Based on a Workshop Convened at the Academy of Natural Sciences: 6-9.

Ryder OA, Benirschke. 1997. The potential use of "cloning" in the conservation effort. Zoo Biology 16:295-300. [PDF]

Ryder OA, Benveniste RE, et al. 1989. Molecular and chromosomal evolution in the mammalian order Perissodactyla [abstract]. Journal of Cellular Biochemistry 41(Suppl 13A):104.

Ryder OA, Bowling AT, Brisbin PC, Carroll PM, Gadi IK, Hansen SK, Wedemeyer EA. 1984. Genetics of Equus przewalskii Poliakov 1881: analysis of genetic variability in breeding lines, comparison of equid DNAs, and a brief description of a cooperative breeding program in North America. Equus 2:207-228.

Ryder OA, Brisbin PC, Bowling AT, Wedemeyer EA. 1981. Monitoring genetic variation in endangered species. In: Scudder GGE, Reveal JL, eds. Evolution today: Proceedings of the Second International Congress of Systematic and Evolutionary Biology. p. 417-424. [PDF]

Ryder OA, Byrd ML. 1984. One medicine: a tribute to Kurt Benirschke. New York: Springer-Verlag. 373 p.

Ryder OA, Chemnick LG. 1983. Relative hypomethylation of CpG residues in a (dG+dC) -rich satellite DNA from Equus przewalskii [abstract]. Journal of Cell Biology 97:379a.

Ryder OA, Chemnick LG. 1990. Chromosomal and molecular evolution in Asiatic wild asses. Genetica 83:67-72. [PDF]

Ryder OA, Chemnick L G. 1993. Chromosomal and mitochondrial DNA variation in orang utans. Journal of Heredity 84:405-409. [PDF]

Ryder OA, Chemnick LG, Bowling AT, Benirschke K. 1985. Male mule foal qualifies as the offspring of a female mule and a jack donkey. Journal of Heredity 76:379-381. [PDF]

Ryder OA, Chemnick LG, Schafer SF, Shima AL. 1989. Individual DNA fingerprints from Galapagos tortoises, Geochelone elephantopus. International Zoo Yearbook 28:84-87. [PDF]

Ryder OA, Davis RL. 1985. A genetic comparison of Dasypus novemcinctus and D. hybridus based on electrophoretic studies. In: Montgomery GG, ed. The evolution and ecology of armadillos, sloths and vermilinguas. Washington, DC: Smithsonian Institution. p. 143-146.

Ryder OA, Dunn M, Burks P. 1989. Visions of an earth restored. Sequoia 9(3):4.

Ryder OA, Epel NC, Benirschke K. 1978. Chromosome banding studies of the Equidae. Cytogenetics and Cell Genetics 20:323-350. [PDF]

Ryder OA, Feistner ATC. 1995. Research in zoos: a growth area in conservation. Biodiversity and Conservation 4:671-677. [PDF]

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Ryder OA, Fleischer RC. 1996. Genetic research and its application in zoos. In: Kleiman DG, Allen ME, Thompson KV, Lumpkin S, Harris H, eds. Wild mammals in captivity: principles and techniques. Chicago: University of Chicago Press. p. 255-262. [PDF]

Ryder OA, Hansen SK. 1978. Localization of nucleotide sequences complementary to the satellite DNA of Przewalski s horse in metaphase chromosomes of Przewalski s horse (2n = 66) and Hartmann s mountain zebra (2n = 32) [abstract]. Journal of Cell Biology 79:127a. [PDF]

Ryder OA, Hansen SK. 1979. Molecular cytogenetics of the Equidae. Chromosoma 72:115-129. [PDF]

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Ryder OA, Houck ML, Kumamoto AT. 1987. Rhinoceros genetics: the state-of-the-art and application to conservation measures. In: AAZPA Annual Conference Proceedings; 1987. p. 710-714.

Ryder OA, Kavenoff R, Smith DW. 1976. Properties of membrane-associated folded chromosomes of Escherichia coli during the DNA replication cycle. In: Goulian M, Hanawalt PC, eds. DNA synthesis and its regulation. Menlo Park (CA): W.A. Benjamin. p. 159-186.

Ryder OA, Kumamoto AT, Aman RA, Jonyo J. 1990 A genetic puzzle: hromosomes of waterbuck Kobus ellipsiprymnus in Lake Nakuru National Park, Kenya. ZooNooz 63(9):12-13.

Ryder OA, Kumamoto AT, Durrant BS, Benirschke K. 1989. Chromosomal divergence and reproductive isolation in dik-diks (genus Madoqua, Mammalia, Bovidae). In: Otte D, Endler JA, eds. Speciation and its consequences. Sunderland (MA): Sinauer Associates. p. 208-225.

Ryder OA, Kumamoto AT, Kingswood SC. 1991. Oman s desert treasure: the Arabian oryx. ZooNooz 64(9):6-8.

Ryder OA, Kumamoto AT, Patterson J, Benirschke K. 1980. The chromosomal complement of Equus przewalskii Poliakoff. Equus 2(1):43-51. [PDF]

Ryder OA, Massena R. 1988. A case of male infanticide in Equus przewalskii. Applied Animal Behavior Science 21:187-190.

Ryder OA, McLaren A. 2002. DNA banks for endangered species: an interface between utilization and conservation of biological diversity in the era of genomics. In: AAAS Annual Meeting and Science Innovation Exposition; 2002 Feb 14-19; Boston (MA).

Ryder OA, McLaren A, Brenner S, Zhang YP, Benirschke K. 2000. Ecology: DNA banks for endangered animal species. Science 288(5464):275-277.

Ryder OA, McLaren A, Zhang YP, Brenner S, Benirschke K. 2000. Preservation of DNA from endangered species — response. Science 289(5480):725-727.

Ryder OA, Shaw JH, Wemmer CM. 1988. Species, subspecies and ex situ conservation. International Zoo Yearbook 27:134-140. [PDF]

Ryder OA, Smith DW. 1974. Isolation of membrane-associated folded chromosomes from Escherichia coli: effect of protein synthesis inhibition. Journal of Bacteriology. 120(3):1356-1363. [PDF]

Ryder OA, Smith DW. 1974. Sedimentation studies of the membrane-associated form of the folded chromosome of E. coli during the DNA replication cycle. Fed. Proc. 33:1419.

Ryder OA, Smith DW. 1975. Properties of membrane-associated folded chromosomes of E. coli related to initiation and termination of DNA replication. Cell 4:337-345. [PDF]

Ryder OA, Sparkes RS, Sparkes MC, Clegg JB. 1979. Hemoglobin polymorphism in Equus przewalskii and E. caballus analyzed by isoelectric focusing. Comparative Biochemistry and Physiology Part B 62(4):305-308.

Ryder OA, Steiner CC. 2009. How much hybridization and in what direction? Animal Conservation 12:516-517. [PDF]

Ryder OA, Trommershausen-Smith A, Hansen SK, Suzuki Y, Sparkes MC, Sparkes RS, Clegg JB, Oosterhuis JE, Nelson LS, Robinson PT, Meier JE, Benirschke K. 1979. Genetic variation in Przewalski's horses, Equus przewalskii, of the Munich line in the United States. In: de Boer LEM, Bouman JG, Bouman I, eds. Genetics and hereditary diseases of the Przewalski horse. Rotterdam: Foundation for the Preservation and Protection of the Przewalski horse. p. 41-60. [PDF]

Ryder OA, Wedemeyer EA. 1982. A cooperative breeding programme for the Mongolian wild horse Equus przewalskii in the United States. Biological Conservation 22:259-271. [PDF]

Ryder OA, Zimmerman W, Bowling K, Bowling A. 1990. Report on CMPWG visit to USSR. In: 5th International Symposium on the Preservation of the Przewalski Horse. p. 332-335. [PDF]

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