It must become a bit of a bore spending all day staring back at the visitors when you're inside the gorilla enclosure at the zoo. After all, once you've seen one pointing and gawping human, you've seen them all.
So this inquisitive pair from Calgary Zoo in Alberta, Canada, were clearly glad of the change when a fearless caterpillar crawled across the fence right in front of them. Just look how intrigued they were. Mind you, if they think that's impressive, imagine how they're going to feel when it turns into a butterfly.
Ah, this could be the beginning of a beautiful friendship. Talking of which, if you'd like to see some more unlikely animal pals, take a look at our slideshow below...