Buteo lagopus

Rough-legged Buzzard / Fjällvråk

Main author:
Stina Andersson, November 2014.

Supplemented by:
Magnus Hellström, November 2014.

Citation: 
Ottenby Bird Observatory. 2015. Ringers' DigiGuide - Asio otus. 
www.ringersdigiguide.ottenby.se
 
MOULT:
                      Adult          Young
summer        
SC*              -
winter             -                   -
Young: No moult is conducted during the first autumn.
First adult SC: A complete moult is initiated during the spring but arrested during early autumn. Primaries are moulted i one single wave, and according to Forsman (1998) all birds seem to leave 1-4 outer PP unmoulted juvenile, and often also one or a few SS and/or RR.
Adult SC: A complete moult is initiated during late spring and is finishedarrested during the autumn. All PP are moulted in two simultaneous waves. Single or some unmoulted SS ar often seen.
AGE:

Autumn
Spring
SEX:

Autumn and spring
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