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Birds: birds can walk on the ground and fly as well., Some birds can also swim in the water. A bird has, streamlined body. Its bones are light and strong. They are, hollow and have air spaces between them. The hind limbs, of birds are modified as claws, which help it to walk and, to perch. Birds have special flight muscles and the, forelimbs are modified as wings. The wings and tail have, long feathers, which help in flying., , Snake: The body of snake consists of a large number of, vertebrae. The adjoining vertebrae, ribs and skin are, interconnected with slender body muscles. When the, snake moves, it makes many loops on its sides. The, forward push of the loops against the surface makes the, snake move forward. Movement of snake is called, slithering movement.