|Class 9 Biology Diversity In Living Organisms||Aves|
The animals belonging to this group are warm-blooded.
They have a four-chambered heart.
They breathe through lungs.
They lay eggs to give birth to their young ones.
These animals have an outside layer of feathers.
They also characterized by two forelimbs, toothless beaked jaws, and are adapted to fly.
Birds belong to this group.