What Is a Bird?: What Are Birds?

Birds are vertebrate animals similar to reptiles, fishes, and amphibians, but they are warm-blooded, maintaining a constant body temperature. Most birds can fly, thanks to their unique body design, including wings, powerful chest muscles, and lightweight, often hollow bones. Feathers, exclusive to birds, aid in flight and insulation. Birds reproduce by laying eggs, with young developing inside before hatching. In summary, birds are warm-blooded, flying vertebrates with wings, feathers, and egg-laying capabilities.

What characteristic distinguishes birds from reptiles, fishes, and amphibians?

• They live in water.

• They have a backbone.

• They are warm-blooded.

• They are cold-blooded.

What is a common feature of most birds?

• They can dig.

• They can run fast.

• They can fly.

• They can swim.

What helps birds to fly?

• Sharp beaks

• Heavy bones

• Strong legs

• Powerful chest muscles

What is unique about bird feathers?

• They are colorful.

• They are edible.

• They are waterproof.

• They are lightweight and tough.

How do birds reproduce?

• By giving live birth

• By laying eggs

• By budding

• By splitting