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a family of birds of the order Passeriformes. Members of this family are characterized by the distinctive structure of the lower throat. Several species are capable of producing unusual bell-like, howling, or bellowing sounds. The body measures 10 to 50 cm long. Most species have brilliant plumage. There are approximately 90 species, found in the tropical forests of Central and South America. The birds nest in hollow trees; several species attach their nests to rocks. They feed on fruits, berries, insects, and other invertebrates.