>>Ummm...the Great Bustard bird has been known to weigh up to 46 pounds reference here. So there goes your “physically impossible” claim right off the bat.<<
No it doesn’t. What it means is that I got my number wrong. 46 lbs is still a far cry from “over 200 lbs”. ;)
Weight is not the determining factor. If it were, our huge aircraft couldn't fly. Form is the determining factor. For example, Pterosaur bones were hollow and air filled, like the bones of birds. They had keeled breastbones that supported flight muscles and specialized respiratory systems. Even the brain region that integrates signals from joints, muscles, skin and balance organs was larger than that of any other known vertebrate -- 7.5% of total brain mass as compared to 1% to 2% in modern birds.
They existed. We have their bones and other fossils to prove it. They did not exist 6000 years ago or less no matter what "creationists" insist to the contrary.