As I recall we were told the mix of pure-bred chimps is something unfortunate like the old females are and the fertile males aren't, can't quite remember the details.
Aren't Edinburgh's maintained as single group with the 'right' animals allowed to breed and the others prevented. Does it have to be a 'new' group/old group set-up.
Aren't Edinburgh's maintained as single group with the 'right' animals allowed to breed and the others prevented. Does it have to be a 'new' group/old group set-up.