> The largest birds are smaller than the largest mammals on land or at sea With all my respect to you theory I think comparing size of animals should not ignor

> The largest birds are smaller than the largest mammals on land or at sea With all my respect to you theory I think comparing size of animals should not ignore the medium they moved in: water, land or air. Weight is (loosely but still) related to size. It’s probably not a coincidence the largest mammals lives on water where they need less energy to supper their weight, and it’s not a coïncidents the largest mammals on earth are way bigger that bats. The biggest bats are ~1.7m which is not so far from biggest albatros (3.7m). Also consider the biggest bird (Ostriches) can’t fly. Now I’m trying to picture a swimming gigantic bird.