Distinctive Characters Of Birds: Birds are feather-clad, air-breathing, warm-blooded, oviparous (egg-laying) and bipedal flying vertebrates. They have a streamlined spindle-shaped body that helps them to fly in the air. The bird’s body is divisible into four distinct parts- head, neck, trunk, and tail. Jawbones are prolonged into a tooth-less beak or bill. The neck is