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The Roseate Tern (Sterna Dougallii) is a medium-sized, colonial-nesting, marine water bird. White with a black head cap and a long and deeply forked tail with white streamers, their wings are frosted with silver-grey and edged with black. In the species that breed in the northeast, the bill is black in May and becomes progressively redder from the base toward the tip during the mating season, turning blacker again in August. Also during the mating season their legs turn red and the underside of this bird is creamy-white with a pink blush. They are 13-16 inches (33- 41 cm) in length and weigh between 3.18-4.94 ounces (90-140g).