Distribution in HK: Common

Total count in the surveys: 8

Plumages variable across subspecies, but all are a combination of black, grey and white. A black new moon-shaped patch on chest.

亞種間羽色多變，但都是黑、白、灰的配搭。胸有一新月形黑斑。

Roosts communally.

大群聚集棲息。