S u b i k i i i i l v BUCElUrriNyE.
Bill generally powerful, covered with a casque or casquc-like protuberance. Nude skin
nearly always present around the eyes, occasionally also at base of bill and on tbe throat, but
usually limited in extent. One species only has the lace 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. Tlie
members of this subfamily are tree-dwellers, and only occasionally leave their abode among
the branches to descend to tlie earth.