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Pycnonotus is a genus of frugivorous passerine birds in the bulbul family Pycnonotidae.
The genus name is from Greek: puknos "thick" or "compact" and -nōtos "-backed".

1/ Red-vented bulbul (Pycnonotus cafer, Bông lau đít đỏ)
2/ Stripe-throated Bubul, or streak-throated bulbul (Bông lau họng vạch, Pycnonotus finlaysoni)
3/ Yellow-vented bulbul, or eastern yellow-vented bulbul (Bông lau mày trắng, Pycnonotus goiavier)
4/ Brown-breasted bulbul, also Anderson's Bulbul (Bông lau ngực nâu, Pycnonotus xanthorrhous) 
5/ Sooty-headed bulbul (Bông lau tai trắng, Pycnonotus aurigaster) 
6/ Irrawaddy or Streak-eared Bulbul, or Blanford's Olive Bubul (Bông lau tai vằn, Pycnonotus blanfordi)
7/ Light-vented bulbul, also called the Chinese bulbul (Bông lau Trung Quốc, Pycnonotus sinensis)
8/ Flavescent bulbul (Bông lau vàng, Pycnonotus flavescens) 
9/ Red-whiskered bulbul, or crested bulbul (Chào mào, Pycnonotus jocosus)

Red-Vented Bulbul
(Pycnonotus cafer, Bông lau đít đỏ)

The red-vented bulbul (Pycnonotus cafer) is a member of the bulbul bird family Pycnonotidae of passerines.

Distinguished from the similar sooty-headed bulbul: sooty-headed bulbul has tan and pale front, some subspecies of the sooty-headed bulbul have yellow venter. The red-vented bulbul only has red-venter and has dark body color.

The genus name Pycnonotus is from Greek: puknos "thick" or "compact" and -nōtos "-backed".

Cafer: Jaʽfar meaning in Arabic "small stream/rivulet/creek". It may also be transliterated Jafar, Jaffar, Jafer, Jaffer, Jafur. The Turkish spelling of the name is Cafer, the Azerbaijani Cəfər, the Bosniak Džafer and the Albanian Xhafer.

Sooty-Headed Bulbul 
(Bông lau tai trắng, Pycnonotus aurigaster) 

The sooty-headed bulbul (Pycnonotus aurigaster) is a species of songbird in the Bulbul family, Pycnonotidae.

Distinguished from the similar red-vented bulbul: by its tan and pale front, less extensive area of black on its head and gold-colored vent in certain subspecies.

The genus name Pycnonotus is from Greek: puknos "thick" or "compact" and -nōtos "-backed".
aurigaster Latin aurum gold; gaster belly, borrowing from Ancient Greek γᾰστήρ (gastḗr, “paunch, belly”).

Stripe-throated Bubul, or streak-throated bulbul 
(Bông lau họng vạch, Pycnonotus finlaysoni)

The stripe-throated bulbul, or streak-throated bulbul, is a species of songbird in the bulbul family of passerine birds.

The genus name is from Greek: puknos "thick" or "compact" and -nōtos "-backed".