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These highly gregarious waders often feed by sweeping the bill side to side, sifting through mud as they walk through shallow water. Their diet includes small fishes and aquatic invertebrates, as well as some plant material. They are found in coastal marshes, lagoons, mudflats, and mangrove keys, foraging in both salt and fresh water. Flocks typically include fewer than half a dozen individuals, but they are often associated with other wading birds as well. In courtship, male and female spoonbills first interact aggressively, then perch close together, presenting sticks to each other and crossing and clasping bills. They typically nest in mangroves or other trees and shrubs 5 to 15 feet above ground or water, but sometimes nest on the ground. The nest, a bulky platform of sticks with a deep twig- and leaf-lined center, is built mainly by the female with material brought by the male. Clutch size is 2 to 3 eggs (range 1 to 5). The white eggs are spotted with brown. Eggs are incubated (by both sexes) for 22 to 24 days. Both parents feed the young. Young may leave the nest after 5 to 6 weeks and are capable of strong flight at around 7 to 8 weeks. Roseate Spoonbills are mostly silent, but make a soft frog-like croak when disturbed.
(Matheu and del Hoyo 1992; Kaufman 1996; AOU 1998; Dunne 2006)