Pigeon as one of tame bird

Pigeon as one of tame bird, Pigeons and doves constitute the family Columbidae within the order Columbiformes, which include some 300 species of near passerine birds. In general parlance the terms "dove" and "pigeon" are used somewhat interchangeably. Pigeons and doves are stout-bodied birds with short necks, and have short slender bills with a fleshy cere. The species commonly referred to just as "pigeon" is the feral Rock Pigeon, common in many cities. Doves and pigeons build relatively flimsy nests from sticks and other debris, which may be placed in trees, on ledges or on the ground, depending on species. They lay one or two eggs, and both parents care for the young, which leave the nest after 7 to 28 days. Doves feed on seeds, fruit and plants. Unlike most other birds (but see flamingo), the doves and pigeons produce "crop milk," which is secreted by a sloughing of fluid-filled cells from the lining of the crop. Both sexes produce this highly nutritious substance to feed to the young.

The Life of Birds

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A common sight in cities around the world, Rock Pigeons crowd streets and public squares, living on discarded food and offerings of birdseed. In addition to the typical blue-gray bird with two dark wingbars, you'll often see flocks with plain, spotted, pale, or rusty-red birds in them. Introduced to North America from Europe in the early 1600s, city pigeons nest on buildings and window ledges. In the countryside they also nest on barns and grain towers, under bridges, and on natural cliffs. Pigeons mate for life and rear their broods together, although if one dies the other will take a new mate. Once the simple nest is built, the female lays an egg and then another a day or so later. The incubation period for common pigeons is 17 to 19 days. The female sits on the egg from late afternoon through the night until about 10AM. The male then takes over and does the day shift. Once the eggs hatch, both parents feed the young squabs. The first food is pigeon milk or crop milk, a cheesy substance that appears in the crops of the parents at hatching time and is fed for a week or so. Then the adults start regurgitating partially digested grains for the young. By the time the squabs are ready to fly, about 4 weeks, the father is doing most of the feeding. The squabs are fed for another week to 10 days after they are free-flying.

Sources : Wikipedia allaboutbirds