Comment on Baby Birrin by Abiogenisis
I'm thinking of theropods and game chickens which are bipedal but are "alien" looking. Although most feathered dinosaurs I've seen have longer back limbs than forelimbs, how plausible is a species that has longer arms than legs?
The problem is always weight. As long as the centre of balance is over the hips you should be fine, either by creating a big heavy butt, or thin arms.
Another question: since the Birrin are an egg-laying species, how do female Birrin cope with this? I can't imagine it's very comfortable pushing out unfertilized eggs on a regular basis, unless they lack the hip width/baby head size problems humans have.
They dont have the same constraints that humans do, though it is a fair point. I based it on the way certain Poison Arrow frogs feed their tadpoles. Perhaps the birrin lay soft eggs?