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This bird is a Victoria Crowned Pigeon. The crowned pigeon is quite spectacular, being blue in colour and as tall as a turkey (74 cm). It has a large crest of feathers on its head that can be raised - hence its name. It is the largest of all living pigeons and is found in the wild only in New Guinea and some smaller offshore islands nearby. [...]
Pigeons, a Darwin Favorite, Carry New Clues to Evolution - NYTimes.com: Researchers have found that mutations in pigeon DNA can control a variety of traits, including the directions of their feathers grow, like in this Jacobin pigeon. Charles Darwin raised pigeons and was interested in their breeding as an extreme example of domestic selection. Robert Clark.