Black Kite roost

Info from Hong Kong's Great Outdoors

Surely Hong Kong’s signature birds, black kites can be seen soaring amongst and over high-rises, as well as over hills. In late afternoon, many of them head for one of east Asia’s largest black kite roosts, on wooded hillsides southeast of the Peak, near Magazine Gap. Numbers are highest in winter.

Vantages include the junction of Guildford and Peak roads, near Magazine Gap, along routes of bus 15 from Central and 15B from Causeway Bay.

Black Kite articles/photo albums elsewhere on the Internet

Black-eared Kite is an informative article from August 1930 issue of Hong Kong Naturalist (pdf file).

Black Kite has a photo and brief info on black kites in Hong Kong. 

Black Kite in Hong Kong is a HK Birdwatching Society forum thread, covering an event to watch kites coming into roost. Has photos, also some posts in Chinese.
Black-eared Kite is HKBWS forum that includes this thread. (Note that the kites are now believed to be same species as Black Kites of Europe - not separate, as they were considered for a while.)
Black Kite is from HKBWS Kite Research Group; a pdf file, evidently from a Powerpoint presentation.