The Scarlet ibis (Eudocimus ruber) is a species of ibis found in tropical South America and part of the Caribbean. In form, it resembles most of the other twenty-seven extant species of ibis, but its remarkably brilliant scarlet coloration makes it unmistakable. It is one of the two national birds of Trinidad and Tobago, and its Tupi–Guarani name, guará, is part of the name of several municipalities along the coast of Brazil. This medium-sized wader is a hardy, numerous, and prolific bird, and it has protected status around the world.
Adult plumage is virtually all scarlet. The feathers may show various tints and shades, but only the tips of their wings deviate from their namesake color. A small but reliable marking, these wingtips are a rich inky black (or occasionally dark blue) and are found only on the longest primaries - otherwise, the birds' coloration is "a vivid orange-red, almost luminous in quality." Scarlet ibises have red bills and feet however the bill is sometimes blackish, especially toward the end. They have a long, narrow, decurved bill. Their legs and necks are long and extended in flight. A juvenile scarlet ibis is a mix of grey, brown, and white. As it grows, a heavy diet of red crustaceans produces the scarlet coloration. The color change begins with the juvenile's second molt, around the time it begins to fly: the change starts on the back and spreads gradually across the body while increasing in intensity over a period of about two years.
Scarlet ibises are found throughout South America and the Caribbean islands. Native flocks exist in Brazil; Colombia; French Guiana; Guyana; Suriname; and Venezuela, as well as the islands of the Netherlands Antilles, and Trinidad and Tobago. There is an outlying colony in the Santos-Cubatão mangroves of the Baixada Santista district in southeastern Brazil, which is considered critically endangered. Scarlet ibises perform seasonal shifts and migrations within their range. they inhabit wetlands and other marshy habitats, including mudflats, mangroves, freshwater lakes, and rainforests.
Scarlet ibises are social and gregarious birds. They live in flocks of thirty or more. Members stay close, and mating pairs locate their nests in close proximity to other pairs in the same tree. For protection, flocks often congregate in large colonies of several thousand individuals. They also regularly participate in mixed flocks, gaining additional safety through numbers: storks, spoonbills, egrets, herons, and ducks are all common companions during feedings and flights.
Scarlet ibises are highly migratory and are able to fly on very long distances; during migration, they move as flocks in a classic V formation. When flying the birds soar and glide usually at great heights and speeds. Scarlet ibises are active during the day and spend most of their time foraging. When feeding, they use their distinctive long, thin bills to probe for food in soft mud or under plants. When they need to communicate with each other, the birds will make a honking noise. The nestlings have a shrill cry used to let parents know that they are hungry.
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