Yesterday there was an interesting touch table in Realm of the Red Ape where you could see the hair of each orang species and the difference in colour between them, and replica skulls from man, a male and a female orang. Quite surprising how small the orang skulls were, and the differences between those of a female and a dominant male.
Hate to say it, but the baby black-tailed marmoset is very cute, pictures don't do it justice.