The young hatch from the eggs. They are warm-blooded. Birds breathe faster than mammals and their bodies are warmer. A turtle lays eggs, but it is not a bird. Birds give us meat and eggs.
Some birds make good pets.
The Ostrich is the largest bird. It lives in Africa. It can run as fast as a horse, and can kick very hard. The ostrich has wings, but does not fly. Birds can be grouped by where they live - land birds, water birds, Arctic birds, tropical birds.