- Feathers are too dissimilar to scales
– Scales are sheets that cover the body – feathers are more like hair follicles
– Reptiles shed their skin including scales all at once in one large piece – one event. Birds lose feathers one at a time.
– Feathers are well designed for flight – interlocking barbules which close on the down stroke so as to be impenetrable to air and provide lift for the bird and open on the up stroke to allow air to flow through to make it easier to lift up the wing.
- Dinosaurs are reptiles, which are cold-blooded (ectothermic) and birds are warm-blooded (endothermic).
- Birds have avian (flow through) lungs, while dinosaurs do not.