A large bird, the Blyth's hornbill can reach up to three feet in height. Males and females both possess long, white tail feathers, black wings and bodies, and bright blue coloration around the eyes. The sexes can be distinguished by the color of the feathers on their heads. Females have black feathers, while males' heads are reddish-brown. The Blyth's hornbill's beak, which can reach up to 10 inches in length, is topped with a large, hollow structure called a casque. The purpose of this casque is subject to debate. Scientists have proposed a number of reasons, ranging from attracting mates to amplifying the hornbill's long calls.
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