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Ramphastids: Toucans, Toucanets, and Aracaris

Characterized by their large and sometimes beautifully colored bills, Ramphastids are easily recognizable. This family is restricted to the tropics of the Western Hemisphere. The purpose of the bill has been speculated over the years. Originally the bill was thought to serve as an attraction to females during courtship and then an adaptation for acquiring and manipulation of fruit. Today scientific research has shown that the bill serves as a heat radiator, thus helping the birds regulate temperature. Although it  looks heavy the bill is actually quite light consisting of a keratin outer shell and a hollow core criss crossed by tin bony supports  
Picture
Swainson's Toucan
Picture
Toco Toucan
Picture
RCP
Picture
Keel-billed Toucan
Husbandry manual
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