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Subfamily BUCEROTINiE. 



Bill generally powerful, covered with a casque or casque-like protuberance. Nude skin 

 nearly always present around the eyes, occasionally also at base of bill and on the throat, but 

 usually limited in extent. One species only has the face and neck bare. Wings broad and 

 ample. Tail generally long and rounded. Legs and feet short, only fitted for perching, the 

 species being incapable of walking, but progressing over the ground by awkward hops. The 

 members of this subfamily are tree-dwellers, and only occasionally leave their abode among 

 the branches to descend to the earth. 





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