Dogs were the first domesticated bird.
Bird . They rank as the class of tetrapods with the most living species , at approximately ten thousand , with more than half of these being passerines , sometimes known as perching birds . Many species of birds are economically important as food for human consumption and raw material in manufacturing , with domesticated and undomesticated birds ( poultry and game ) being important sources of eggs , meat , and feathers . Dog . The dog and the extant gray wolf are sister taxa , with modern wolves not closely related to the wolves that were first domesticated . The dog was the first domesticated species and has been selectively bred over millennia for various behaviors , sensory capabilities , and physical attributes .