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The hornbills (Bucerotidae) are named because the shape of their bill reminded early people of cattle horns. The family has a long, down-curved bill which is frequently brightly coloured. Their beaks are often topped by a large hollow chamber called a casque. Made of keratin, casques are thought to serve as a resonating chamber to amplify the harsh braying calls. Hornbill ivory is not a true ivory as it is not a dentine material, but rather a keratin. Hornbills are the only birds known with their first two cervical vertebrae fused, which most likely helps support their top-heavy beaks.
See also: Black hornbill, Blyth's Hornbill, Crowned hornbill, Great Indian Hornbill, Grey Hornbill, Malabar Grey hornbill, Northern Ground hornbill, Rhinoceros hornbill, Rufous hornbill, Silvery cheeked hornbill, Southern Ground Hornbill, Southern yellow-billed hornbill, Trumpeter Hornbill, Von der Deckens hornbill
Rufous hornbillVon der Decken's hornbillMalabar grey hornbillBlyth's hornbillGrey hornbill, IndiaSilvery cheeked hornbillRhinoceros hornbillCrowned hornbillBlack hornbillNorthern ground hornbillSouthern Ground hornbillSouthern yellow billed hornbillTrumpeter hornbillHemprich's hornbill