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Bulbuls are short-necked slender passerines. The tails are long and the wings short and rounded. In almost all species the bill is slightly elongated and slightly hooked at the end. They vary in length from 13 cm for the tiny greenbul to 29 cm in the straw-headed bulbul. Overall the sexes are alike, although the females tend to be slightly smaller. In a few species the differences are so great that they have been described as functionally different species. The soft plumage of some species is colourful with yellow, red or orange vents, cheeks, throat or supercilia, but most are drab, with uniform olive-brown to black plumage. Species with dull coloured eyes often sport contrasting eyerings. Some have very distinct crests. Bulbuls are highly vocal, with the calls of most species being described as nasal or gravelly.

From Wikipedia, the free encyclopedia
Acritillas indica - Yellow-browed BulbulAlophoixus pallidus - Puff-throated BulbulAlophoixus phaeocephalus - Yellow-bellied BulbulHypsipetes ganeesa - Square-tailed BulbulIxos malaccensis - Streaked BulbulIxos mcclellandii - Mountain BulbulPycnonotus atriceps - Black-headed BulbulPycnonotus aurigaster - Sooty-headed BulbulPycnonotus brunneus - Asian Red-eyed BulbulPycnonotus cafer - Red-vented BulbulPycnonotus conradi - Streak-eared BulbulPycnonotus cyaniventris - Grey-bellied BulbulPycnonotus erythropthalmos - Spectacled BulbulPycnonotus finlaysoni - Stripe-throated BulbulPycnonotus flavescens - Flavescent BulbulPycnonotus flaviventris - Black-crested BulbulPycnonotus goiavier - Yellow-vented BulbulPycnonotus jocosus - Red-whiskered BulbulPycnonotus luteolus - White-browed BulbulPycnonotus melanicterus - Black-capped BulbulPycnonotus penicillatus - Yellow-eared BulbulPycnonotus plumosus - Olive-winged BulbulPycnonotus simplex - Cream-vented BulbulTricholestes criniger - Hairy-backed Bulbul