Birds are as much "flying reptiles" as pterosaurs. Animals with powered flight on the reptile branch of the tree stop looking like what most people think of as

Birds are as much "flying reptiles" as pterosaurs. Animals with powered flight on the reptile branch of the tree stop looking like what most people think of as "reptiles". Powered flight requires a high metabolism, a high metabolism leads to insulation (fur, feathers), furry or feathery animals don't get called reptiles (even if they are, phylogenetically speaking). Pterosaurs almost certainly wouldn't be called reptiles if they existed today.