Birds are bipedal vertebrate animals that have wings, feathers, and a beak with no teeth.
They have a compact body shape in order to facilitate flying.
Birds have one of the most complex respiratory systems of all animals.
They also have powerful hearts in order to circulate the oxygen.
Birds use their feathers for flying, thermal insulation and courtship.
There are around 10,000 species of birds in the world.
Some bird species are popular as pets. Many people love to keep parrots as pets, for example.
Some birds sing, producing beautiful bird songs. These birds are called songbirds and they are able to produce various sound notes.
See these Learning Zone sites also:
Blue Jay Learning Zone
Cardinal Learning Zone
Duck Learning Zone
Eagle Learning Zone
Flamingo Learning Zone
Robin Learning Zone
For information about other animals, visit Animal