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While I enjoy the new images, I still can't understand how an obviously avian species like the Clakker females were designed to have breasts like a mammalian creature. Since female birds don't have breasts, why would they? They would have no need for lactation, as I'm pretty sure that birds can go right to solid foods when they hatch.
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...just in defence of OWI for a minute...

(and you could ask the same thing of the newts.

) Pigeons feed their young on milk, for a short while, although it's made from the lining of their crop/gizzard/whatever (think: like seabird feeding its young on regurgitated, partially digested (?) fish) and there's a bird on the American plains (a sort of grouse, I think) that has air-sacs on its chest that look similar to breasts. :P Mind you, it's the male of the grouse that has them, and for displaying.
The way I tend to think of alien species is that - well, they're aliens, Earthly constraints would be unlikely to force a species along similar lines - who says a bird WOULDN'T evolve along similar lines to a mammal? I mean, if you go far enough back, birds and mammals came from the same stock, and then you have convergent evolution... blahblahblah... And just because they LOOK like breasts doesn't MAKE them breasts, they could just be fatty deposits from a sedentary lifestyle, like men can develop. *shrugs*
Or maybe it's just to make them more amusing and rotund.
