9Wi

地點 : 塱原 LV

日期 : 2013-10-08

A/




B/


根據 According to :

http://www.cnbird.org.cn/shouce/c.asp.htm





A 是棕背伯勞? 身和尾羽的比例是~ 1:0.473 ; 尾羽無白邊。
  Is it a Long-tailed Shrike? As the ratio of the body to the tail is appro. 1:0.473; No white edge is observed on tail feathers.

B 是栗背伯勞? 身和尾羽的比例是~ 1:0.425 ; 尾羽有白邊。
  Is it a Burmese Shrike? As the ratio of the body to the tail is appro. 1:0.425; White edge is observed on tail feathers.

Many thanks!

John Holmes

It is Long-tailed Shrike...

The rufous on the back of Burmese Shrike is quite intense, and Burmese Shrike looks relatively compact.

Photo here http://orientalbirdimages.org/search.php?p=9&Bird_ID=2403&Bird_Family_ID=&pagesize=1

"O.B.I." is a good photo-reference site for many asian species.

9Wi

Many thanks John.

ajohn

Bird B is moulting it's tail, and I think has lost the longest inner tail feathers. This makes the tail look shorter than normal, which is one reason for your confusion.
The small pale tip/fringe to the tail feathers is typical in Long-tailed Shrike but can wear off over time.

9Wi

Thanks ajhon for the explanation.