There are about 8,600 Species of birds of which about 1,200 Species are known to occur in India. The birds (modern) can be conveniently divided into two categories.
1)Flightless Birds: These are birds which cannot fly. They have either rudimentary or vestigial wings. The most familiar examples are Ostrich, Emu, Rheu, Cassowary , Kiwi etc.
2)Flying birds : These are the birds which can fly, can be grouped into several homogenous groups such as
· Swimming birds and diving birds
· Shore and wading birds
· Birds of prey
· Arboreal birds
· Aerial birds
· Terrestrial birds
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