Question

Describe the important characters of birds.  

Answer 1

Birds are warm-blooded vertebrates whose bodies are mostly covered with feathers. Their forelimbs are modified into wings, and their jaws form a toothless horny beak. Their light, often air-filled bones and lungs with air sacs are adaptations associated with flight. They have a four-chambered heart, reproduce by internal fertilisation and lay large, yolk-rich eggs with hard shells.