Quote:
Originally Posted by ericthered
*yes, all mammals produce milk for their young, but almost none keep the enlarged glands year round as a secondary sexual trait and pad them with fat to make them look bigger.
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Humans are not unique, once again, although we're different.
Another primate (Geladas) has reshaped their breasts as a primary sexual display - in their case the teats have moved very close together and the breasts form a good replica of the female reproductive opening (including colour changes as she goes through her fertility cycle).
Like humans, geladas spend a lot of time upright instead of standing on all fours, which hides the rump (where primates normally do their sexual display). Unlike (prehistoric) humans, geladas are spending all day sitting on their rump, which hides it even further. And interestingly, like humans, geladas have put a mimic of their rump on their chests to compensate for this - it's just a different part of the rump.
Mandrils are another primate which has mimic'd its rump on its front, but in this case males repeat the colour pattern of their reproductive organs on their faces.
And that's just inside the primates.
Making breasts into big fatty hemispheres that mimic the gluteus maximus and associated fat pads is unique to humans, but the general idea is not.