chimpanzee

There have been a few high profile cases of researchers teaching gorillas and chimps sign language. Here Tumblr shares some of the dark and incredible moments with different apes and ASL. For some more everyday moments of animal intelligence, here are the most creepily intelligent things peoples pets have done. For some interesting tumblr animal stuff, here's an informative thread on how cats became domesticated.

These zookeepers experienced some alarmingly close brushes with unexpectedly dangerous animals. Whatever you might see in an animal's appearance is just that; it's what's taking place in the brain that occupies their skull, you need be wary of. With no way to understand animals on a verbal level, we've gotta fall back on our crazy thing called an animal instinct.