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! Author: John Holmes Time: 9/10/2013 14:19 Subject: Mystery shrike ?
It is Long-tailed Shrike...
The rufous on the back of Burmese Shrike is quite intense, and Burmese Shrike looks relatively compact.
"O.B.I." is a good photo-reference site for many asian species. Author: 9Wi Time: 9/10/2013 14:40
Many thanks John. Author: ajohn Time: 9/10/2013 15:02
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. Author: 9Wi Time: 9/10/2013 21:09
Thanks ajhon for the explanation.
Welcome to HKBWS Forum 香港觀鳥會討論區 (http://hkbws.org.hk/BBS/)
