Driven by the 1925 Scopes trial and Soviet anti-religious propaganda, Ilya Ivanov attempted to breed a human-chimpanzee hybrid in 1927 to prove evolution.

Chimpanzees That are Not Needed for Breeding and That Have Not Been and Will Never Be Used for Research. This subgroup has the greatest potential for ownership transfer to private long-term care ...

Long-term housing for chimpanzees should meet high standards for quality of care and should be cost effective. The following housing and management criteria were developed with that goal in mind after ...