Olive Bulbul (Iole viridescens) [XC254648]
by Greg Irving from Mae Moei National Park, Tak Province, Thailand (song)
Olive Bulbul (Iole viridescens) [XC336925]
by Sontaya Manawatthana from Ton Nga Chang Wildlife Sanctuary, Tambon Thung Tam Sao, Amphoe Hat Yai, Chang Wat Songkhla, Thailand (call)
Subspecies
Birds in Bangladesh apparently belong to subspecies cacharensis, but further study is needed.
The following 5 subspecies are recognised:
cacharensis (Deignan, 1948) - North-eastern India (southern Assam hills, extreme western Manipur, and Meghalaya) and south-eastern Bangladesh (Chittagong). Considered by some authors to be a distinct species, Cachar Bulbul (Iole cacharensis).
myitkyinensis (Deignan, 1948) - Western and eastern Myanmar. Considered by some authors to be a subspecies of Grey-eyed Bulbul (Iole propinqua).
viridescens Blyth, 1845 - South-western and southern Myanmar (including Arakan) and south-western Thailand.
lekhakuni (Deignan, 1954) - Southern Myanmar (northern Tenasserim) and western Thailand (including Kanchanaburi). Considered by some authors to be a subspecies of Grey-eyed Bulbul (Iole propinqua).
cinnamomeoventris Baker, ECS, 1917 - Southern Myanmar (southern Tenasserim), peninsular Thailand and extreme northern Peninsular Malaysia. Considered by some authors to be a subspecies of Grey-eyed Bulbul (Iole propinqua).
BirdLife International Species Factsheet