Main author: Tobias Lilja Nordin, September 2019.
Supplemented by: Magnus Hellström, September 2019.
Citation: Ottenby Bird Observatory. 2015. Ringers’ DigiGuide – Buteo lagopus. www.ringersdigiguide.ottenby.se
Summer SC* –
Winter – –
First adult SC: Moult initiated during 2cy spring (c. April-May, sometimes even before spring migration). The moult is usually arrested before or during autumn migration, with some retained outermost juv PP (at Ottenby often 2-4 retained), and often also a few juv SS and RR.
Subsequent adult SC: Moult initiated during spring (c. May-June), regularly with two centres in the PP. The moult is usually arrested before or during autumn migration.
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