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更新日期：2015-12-07
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The hornbills (Bucerotidae) are a family of bird found in tropical and subtropical Africa, Asia and Melanesia. They are characterized by a long, down-curved bill which is frequently brightly colored and sometimes has a casque on the upper mandible. Both the common Englishand the scientific name of the family refer to the shape of the bill, "buceros" being "cow horn" in Greek. Hornbills have a two-lobed kidney. They are the only birds in which the first and second neck vertebrae (the atlas and axis respectively) are fused together; this probably provides a more stable platform for carrying the bill. The family is omnivorous, feeding on fruit and small animals. They aremonogamous breeders nesting in natural cavities in trees and sometimes cliffs. A number of species of hornbill are threatened withextinction, mostly insular species with small ranges.
The most distinctive feature of the hornbills is the heavy bill, supported by powerful neck muscles as well as by the fused vertebrae The large bill assists in fighting, preening, constructing the nest, and catching prey. A feature unique to the hornbills is the casque, a hollow structure that runs along the upper mandible. In some species it is barely perceptible and appears to serve no function beyond reinforcing the bill. In other species it is quite large, is reinforced with bone, and has openings between the hollow centre, allowing it to serve as a resonator for calls. In the helmeted hornbill the casque is not hollow but is filled with hornbill ivory and is used as a battering ram in dramatic aerial jousts.
The nature has gifted us with a lot of beautiful and amazing plant and animal species. We happen to see dogs, cats, trees, flowers and birds around us everyday. The view of the living things other than human beings makes us feel thankful to God for all His blessings and wonders. A lot of beautiful birds are there in the air but here is the list of top Most Beautiful Birds in the world.
Best type of bird - Cool America & Bald Eagle Pictures
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