Flight Ability of Winged Creatures from Fossil Record

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.

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Perhaps a certain diet would prove something”flying birds eat fish, for example, while flightless birds do not.

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Er... penguins eat fish. Mutate and Survive

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