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Collared laughingthrush 
(Khướu đầu đen má xám, Trochalopteron yersini)

Leiothrix Leiothrichidae Ancient Greek leios meaning "smooth" and thrix meaning "hair".
The name Trochalopteron combines the Ancient Greek trokhalos meaning "round" or "bowed" with pteron meaning "wing".

The collared laughingthrush, endemic to Vietnam, is a species of bird in the family Leiothrichidae.

Trochalopteron is a genus of passerine birds in the laughingthrush family Leiothrichidae.
The name combines the Ancient Greek trokhalos meaning "round" or "bowed" with pteron meaning "wing".

1/ Red-winged laughingthrush (Khướu cánh đỏ, Trochalopteron formosum) 

2/ Collared laughingthrush (Khướu đầu đen má xám, Trochalopteron yersini)
endemic to Vietnam.

3/ Chestnut-crowned laughingthrush (Khướu đầu hung, Trochalopteron erythrocephalum)

4/ Red-tailed laughingthrush (Khướu đuôi đỏ, Trochalopteron milnei)

5/ Black-faced laughingthrush (Khướu mặt đen, Trochalopteron affine)

6/ Golden-winged laughingthrush (Khướu Ngọc Linh, Trochalopteron ngoclinhense)

7/ Scaly laughingthrush (Trochalopteron subunicolor)

8/ Blue-winged laughingthrush (Khướu vảy, Trochalopteron squamatum)