![]() They are also birds of incredible habits. ![]() The chicks of some hornbills possess paired air sacs located on either side of the dorsal midline, the function of which (if they have one) is completely unknown. Furrows, grooves and serrations sometimes mark their great, curved bills giant, lavish eyelashes, enormous tail feathers and brightly coloured neck and facial skin are present in some species and fused cervical vertebrae and bilobular kidneys are peculiar to the group. Great casques that form huge cylinders or curved, rhino-like horns decorate the heads of some species. Hornbills are also birds of splendid and remarkable anatomy. Hornbills are slow to mature, Buceros not breeding until four or five years of age. ![]() Sexual dimorphism is extreme in some species, with the males of some being as much as 66% larger than the females. The largest species have wingspans of over 1.5 m and weigh as much as 6 kg (in the case of the Southern ground hornbill Bucorvus leadbeateri) some (the Great hornbill Buceros bicornis and Southern ground hornbill) can reportedly live for more than 60 or even 70 years. Approximately 60 hornbill species occur across tropical Africa and Asia, and also in the Middle East and Australasia. Hornbills are among the most charismatic, fascinating and awesome of birds, yet surprisingly little is known about them, dedicated studies are few, and they are incredibly elusive and hard to study.
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