Essay About Birds

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Bird is a feathered, two-legged, winged, egg-laying, warm-blooded vertebrate. They are characterized by their feathers, the hard-shelled laying eggs, a beak without teeth, a four-chambered heart, a high metabolic rate, and a lightweight but with strong skeleton. They have more or less feathery wings; the only known species without wings are THE MOA. Wings are evolved fore-limbs, the most of the bird species can fly however flightless birds include penguins, ratites, and diverse endemic island species. Some species of birds, like penguins and duck family are adapted for swimming. Birds also have respiratory and digestive systems that are only adapted for flight. Some birds, especially parrots and corvidae are among the most intelligent one;…show more content…
For better understanding the immense diversity of bird species it is useful to examine the main groups of birds. Many kinds of birds yearly migrate great distances. They are social; communicate with visual calls, signals, and songs, and participating in social behaviors as cooperative breeding. There are many different ways people studies and classified the birds into subgroups. Majority of bird species are socially monogamous maximum for year, but rarely for their entire life. Other species have polygynous (many females) or, rarely, polyandrous (many males) breeding systems. Most of the birds have a long duration of parental care after hatching the eggs which they usually laid in a nest and incubate.
Many species of the birds are economically important like domesticated birds and undomesticated birds (poultry and game) are important sources of meat, eggs, and feathers. Few of them are popular as pets for example songbirds, parrots, and other species. Guano is harvested for use as a fertilizer. About 120 to 130 species have become extinct due to human activity since the 17th century and hundreds earlier. Human activities threaten about 1200 bird species with extinction however the efforts are underway to protect

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