What Is Technically a Bird? Key Traits, Origins, and Definitions
You might picture a bird as any animal with feathers, but scientists have a much more specific idea in mind. Technically, a bird is a warm-blooded vertebrate with feathers, a toothless beak, a four-chambered heart, and wings that usually let it fly. Birds lay hard-shelled eggs, and their bodies have special adaptations for flight—even if…