I recently went to Woburn Safari park and one of the animals I saw was the squirrel monkey, which are really small and pretty cute. These ones were really timid and open for people to pet and get quite close to. They did seem to have quite sad faces though, which started making me think twice about having animimals in zoos, but at least Woburn is a safari park and does allow animals more space and freedom than city zoos, and it does genuinley seems to care for them.