There were Common Buzzards in HK with dark trailing edge to wing and tail. On the field guide, they resemble Rough-legged Buzzard. So be very carefully with that. One can study this using "A database of the Bird of China" http://www.cnbird.org.cn/first.htm or "Oriental Bird Image" http://orientalbirdimages.org/.
HF Cheung Author: wkcheng Time: 21/12/2009 21:37
Some of the photos of Common Buzzard found via the links look very different from what we usually seen.
Thanks! Author: lpaul Time: 22/12/2009 16:41
It is also worth knowing that this feature is age related, adults have a neat dark trailing edge to the wing and also the tail tip; this is lacking in young birds.
Paul
Welcome to HKBWS Forum 香港觀鳥會討論區 (http://hkbws.org.hk/BBS/)