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.