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I mean, if you really want to know nipple amount you could see how many kids wookies normally have at a time.
He's gonna have pecs because he's bipedal tho. Those are arm muscles basically.
If wookies have a litter, then the females would have rows of teats, but they'd only have pecs with the top two. And they'd be basically invisible on a male.
So, we know Chewy has pecs, it's the existence of teats that is unknown
Male breast tissue can be stimulated to produce breast milk. In my fanfiction, Six Voluptuous Chewbacca Tiddies, I will describe in erotic detail---
Are you confirming wookies are, in fact, mammals?
This is huge! Basically confirmation of intergalactic common ancestry 🤯
Dude Wookies don't even live in this galaxy, those humans aren't from here either! It goes waaaay deeper
Twileks and Togrutas both have boobs but i don't think they are mammals.
Convergent evolution
Basically all animals have pecs.
The muscle exists, but doesn't develop in quadrupeds because it doesn't get used.
An incredibly strong biped like a wookie should have massive pecs. Gorillas don't but that's because they're mostly quadapeds. Which I assume is what Lucas copied, but he changed the location without thinking how it would change anatomy.