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A flock of whooper swans has taken a rest on the frozen pond. They have stayed some time now. The pond froze over yesterday so maybe they will leave . (Attachment Link)
Snowy owls do not stay in one place. They migrate from one place to another. The "Norwegian" snow owls belong to the same population as the ones in Siberia, and even Alaska.
A staging post for their trip to the Uk? Maybe.
They do not migrate - they are irruptive - they follow food, or die. Moving away from poor food sources can mean moving Km or 100's Km. The pair that landed on Fetlar in 1967 were fleeing starvation, almost certainly in Scandanavia. In many areas their populations very closely follow lemming populations which rise and fall massively over periods of a few years. In lemming years snowys can rear 6-8, or more chicks, every pair. In crash years most pairs will fail to even produce eggs and any pairs that do will rear just one or two chicks, if any.