If the above is Red-backed Shrike, the first record for the species in HK should be this:
http://www.hkbws.org.hk/BBS/view ... &extra=page%3D7
Actually, on first look these birds seem similar, but I think the 2006 Po Toi bird is a juvenile Brown Shrike.
The ear coverts are dark grey (not red-brown).
The tail is slightly forked (not straight)
The primary projection is shorter, less than half the tail length (the RB Shrike is much longer, half the tail length)
According to Svensson (2009), immature RB Shrikes and immature Brown Shrikes "strongly resemble" one another.
James
