Annie and Missy have such a strange relationship. They are nearly inseparable, but when Missy decides to groom or play with someone else, Annie appears to be jealous. Its very predictable – if you see Missy playing with another chimpanzee, you can bet that Annie is watching her every move from a distance. Sometimes Annie will sit back on her butt and tap her heels on the floor, which is a behavior she often displays when she is anxious. And while Missy likes to interact with the other chimps, Annie mostly keeps to herself when Missy is not around.

Today I was taking photos of Missy and Jamie grooming and playing together outside:

And sure enough, there was Annie in the doorway, keeping an eye on things: