Hi Jon,
If you're talking about pterosaurs, the best evidence that they could fly is that they had lightweight hollow bones and keeled breastbones for anchoring powerful flight muscles, just like birds. These features would surely be impractical on land and serve no useful purpose.
quote:
Perhaps a certain diet would prove something”flying birds eat fish, for example, while flightless birds do not.
Er... penguins eat fish.
Mutate and Survive
"The Bible is like a person, and if you torture it long enough, you can get it to say almost anything you'd like it to say." -- Rev. Dr. Francis H. Wade