Shared Ancestry – Birds are closely related to reptiles, as both evolved from a common ancestor, specifically theropod dinosaurs.
Feathers vs. Scales – While reptiles have scales, birds are characterized by feathers, a key distinction, although feathers are believed to have evolved from reptilian scales.
Eggs and Reproduction – Both birds and reptiles lay eggs with hard shells, a trait they share due to their common evolutionary roots.
Cold-Blooded vs. Warm-Blooded – Reptiles are cold-blooded, while birds are warm-blooded, which is a major difference between the two groups.
Respiratory System – Birds and reptiles have similar respiratory systems, using air sacs for more efficient breathing, unlike mammals.
Claws and Beaks – Birds' beaks and reptiles' claws may seem different, but they share similar genetic traits in their development.