beak
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The beak of the yellow-billed hornbill Tockus flavirostris, common in dry bush country from Ethiopia to South Africa, illustrates one of the extremes to which beaks have evolved. There is, however, no satisfactory explanation for this bizarre adaptation. This species lacks the prominent casque found in some of the larger members of the family.
Horn-covered projecting jaws of a bird (see bill), or other horny jaws such as those of the octopus, platypus, or tortoise.
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