By the time she died at the age of 46, Koko the gorilla was a global superstar. Not only could she apparently understand two thousand words of spoken English and convey her own thoughts and feelings using sign language, but she was even able to give her own pet kitten a name.

Some say that it’s impossible to know whether Koko really understood what she was communicating, or whether she was just trying to please people by signing certain things. Either way, her death raises questions about animals, and the ways in which we try to understand them.

On this week’s Inquiry we examine how recent discoveries are bringing us closer to understanding our fellow creatures. We reveal some surprising animal capabilities, and ask whether we can ever know what it’s like to be anything other than human.

image: European Hamster (Shutterstock)