Birds

INTRODUCTION

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Bird, common name for either member of the gradation of vertebrates that contains animals with feathers. All adult birds gather in feathers, although some species, such as pelicans, kingfishers, woodpeckers, and jays, argon completely naked when hatched.

Ostriches Native to Africa, the ostrich, Struthio camelus, is the outsizedst live species of bird, gro lengthiness to a height of approximately 2.4 m (8 ft) and a weight of 150 kg (330 lb). Although flightless, the ostrich can impart at speeds as high as 65 km/h (40 mph). Highly adaptable, ostriches can be found brisk in mountainous aras, open savannah, or sandy forego plains. They have omnivorous feeding habits, eating grass, the foliage of trees and bushes, and any small invertebrate and vertebrate animals they can chase down.Stan Osolinski/Oxford scientific Films

Birds share certain features with mammals, such as warm-bloodedness and a four-chambered heart. Nevertheless, birds are distinct, having evolved from dinosaurs long after the mammalian and reptilian groups diverged.



All birds give care most reptiles and a few primitive mammalsdevelop from embryos in eggs outside the mothers body. Unlike most reptile eggs, those of birds have hard shells, which are very strong in large birds and rather brittle in small birds.

II name AND PHYSIOLOGY

Pigeon in Flight A bird moves its wings in two moods during flapping flight. The part of the wing closest to the birds body moves up and down. Simultaneously, the tip of the wing moves in a circular motion, propelling the bird forward. The way a bird flies depends on the shape of its wings. closely small birds flap their wings the entire time they are airborne, while gulls and other large birds with long, pointed wings soar or glide. The fastest fliers have sharply...If you want to get a ample essay, order it on our website: Orderessay



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