This accession consists of records documenting the research of J. (Jonathan) D. Ballou, Population Manager and a conservation geneticist. Animals documented in this research include Bali mynahs, grizzly bears, oryxes, tamarins, maned wolves, cheetahs, ibex, California condors, small-clawed otters, tigers, Przewalski's horses, black palm cockatoos, black rhinoceroses, wildebeests (gnus), pygmy hippopotamuses, elephant shrews, sables, elephants, marmosets, orangutans, greater galagos, Guam rails, red pandas, Micronesian kingfishers, giant pandas, and white-faced sakis. Materials include correspondence, memoranda, reports, reproductive data, data analysis programs, notes, audiotapes, videotapes, and related materials. Some materials are in electronic format, including punch cards. Some materials were created by predecessor offices, including the Office of Animal Management (through 1979), the Office of Animal Programs (1979-1984), and the Department of Zoological Research and Education (1984-1985).