Number of Bird Species in the World:
There are over 10,000 species of birds in the world. About 925 have been seen in the U.S. and Canada. About 1,000 have been seen in Europe. By far the largest concentration of bird species are found in South America. Over 3,200 species have been seen there. In Colombia, Bolivia and Peru the species count for each country tops 1,700. Here are some very general figures for the species count for each continent:

3,200 South America
2,900 Asia
2,300 Africa
2,000 North America (from Panama north + Caribbean)
1,700 Australia + surrounding islands
1,000 Europe
65 Antarctica

WATERFOWL (Anseriformes)	SWIFTS & HUMMING BIRDS (Apodiformes)	OSTRICHES, CASSOWAIRES, EMUS, KIWIS & RHEAS (Struthioniformes)
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NIGHT BIRDS (Caprimulgiformes)	SHOREBIRDS & RELATIVES (Charadriiformes)	STORKS & RELATIVES (Ciconiiformes)
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MOUSEBIRDS (Coliiformes)	DOVES & PIGEONS (Columbiformes)	KINGFISHERS & RELATIVES (Coraciiformes)
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CUCKOOS, TURACOS, HOATZIN, & RELATIVES (Cuculiformes)	DIURNAL BIRDS OF PREY (Falconiformes)	DOMESTIC FOWL & GAME BIRDS (Galliformes)
... More	New World Vultures, Condors, Osprey, Hawks, Eagles, Secretarybird, Falcons, Caracaras ... More	... More
LOONS (Gaviiformes)	CRANES, COOTS, & RAILS (Gruiformes)	PERCHING BIRDS (Passeriformes)
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PELICANS & RELATIVES (Pelecaniformes)	WOODPECKERS & RELATIVES (Piciformes)	GREBES (Podicipediformes)
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TUBE-NOSED SEABIRDS (Procellariiformes)	PARROTS (Psittaciformes)	PENGUINS (Sphenisciformes)
... More	African Grey Parrot, Quaker Parrot, Amazon Parrot, Senegal Parrot, Blue Parrot, Macaw Parrot, Meyers Parrot, Lexicon Parrot, Indian Ringneck Parrot, Eclectus Parrot ... More	... More
OWLS (Strigiformes)	TINAMOUS (Tinamiformes)	TROGONS (Trogoniformes)
Barn Owl, Great Horned Owl, Screech Owl, Burrowing Owls, Spotted Owl, Elf Owl, Grey Owl, Horned Owl, Snowy Owl ... More	... More	... More