[petke]

Chimps pout better than any selfie teen. So I don't think that's it

[lawpoop]

Can you post a picture? I did a google image search, but didn't find any pouting chimps.

They do purse their lips, but that's a different set of muscles.

[valarauca1]

All the great apes are social animals. In fact there is a massive overlap between chimp and human body language.

[catmanjan]

Yep this is what I thought instantly, if chimps don't have chins then how are they pouting?