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domestic pigeon
The domestic pigeon (''Columba livia domestica'') is a pigeon that was derived from the rock pigeon. The rock pigeon is the world's oldest domesticated bird. Mesopotamian cuneiform tablets mention the domestication of pigeons more than 5,000 years ago, as do Egyptian hieroglyphics. Research suggests that domestication of pigeons occurred as early as 10,000 years ago.〔 People who keep domestic pigeons are generally called pigeon fanciers. Domestic pigeons can often be distinguished from feral pigeons because they usually have a metal or plastic band around one (sometimes both) legs which shows, by a number on it, that they are registered to an owner.
Pigeons have made contributions of considerable importance to humanity, especially in times of war.〔 In war the homing ability of pigeons has been put to use by making them messengers. So-called war pigeons have carried many vital messages and some have been decorated for their services. Medals such as the Croix de guerre, awarded to Cher Ami, and the Dickin Medal awarded to the pigeons G.I. Joe and Paddy, amongst 32 others, have been awarded to pigeons for their services in saving human lives. Some people living in Urban areas consider pigeons to be pests. Domestic pigeons are sometimes called "thoroughbreds of the air," while feral pigeons are sometimes called "rats with wings." A group of pigeons flying together is called a "kit".〔List of collective nouns#P〕
==Reproduction==
Domestic pigeons reproduce in a similar way to the wild rock pigeon. Generally humans will select breeding partners. Crop milk produced by parent birds may occasionally be replaced with artificial substitutes. Baby pigeons are called ''squeakers'' or ''squabs''.〔 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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