Your roommate is a human if you hand him the jiffy mop and he realizes that you want him to help you clean up the squat.
Your roommate is an ape if you hand him the jiffy mop and he uses it to rappel onto the light fixture, ignoring the mess, and dropping a banana peel on your head.
There, that was easy, wasn’t it?
Seriously, here is a handy guide to differences between and among humans and primate apes.
You heard what they say about “Don’t shoot till you see the whites of their eyes”?
Turns out that works as a primatologists’ joke. Go here for the explanation if you don’t get it.
See also: Science writer starts Not a Chimp blog