How many kinds of birds are there?

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About 9000 different species of birds exist today in our world. They come in all size forms on Colours there are brightly coloured parrots and macaws in tropical America, and large cassowaries and emus that cannot fly in Australia. Tiny warblers and sparrows found in temperate America, and ducks, bustards and cranes in India. Gulls and vultures soar through skies the world over. Plump chickens and turkeys are found in farmyards everywhere.