Definition of tropic bird
: any of a genus (Phaethon of the family Phaethontidae) of web-footed birds that are related to the pelicans, are found chiefly in tropical seas often far from land, and have mostly white satiny plumage marked with a little black, a greatly elongated central pair of tail feathers, and a brightly colored bill
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Britannica.com: Encyclopedia article about "tropic bird"
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