Hornbill
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The hornbill family are remarkable for the very large size of the beak, and the large protuberance that sits atop it. The upper protuberance is hollow and serves as a sounding board to cause reverberations when the bird cries out.
Galleries
Birds: H-ISource
Louis Figuier, Reptiles and Birds (London:Cassell, Petter and Galpin, 1869) 483
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