Birds are interesting flying animals. They are vertebrates and warm blooded animals. They belong to aves class and they can be found all over the world.
Birds breath with their air pocket. Beside as respiration organ, air pocket also can enlarge or reduce their weight when flying or swimming.
There are many kinds of birds. Earth bird has special characteristic. They have different morphology acording to their food and their habitat. Some of them eat seeds, pollen, fish or meat. There are some species that live in land and the others live in water. Land birds live on their nest.
Female birds have specific tasks. they lay eggs and feed their baby, Beside that they look for foods for their baby.