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Unusually warm weather preventing birds from flying south
If the unusually warm weather has left outdoor skiiers and ice skaters out of luck, it has been a boon for bird watchers. According to Birdlife Finland many bird species have postponed their flight south until colder weather arrives. A total of 160 bird species have been observed in Finland, and a couple of them have never even been seen in the country before. The rarest bird species observed in December - the Isabelline Shrike and Hume's Warbler - have not previously been observed during winter months in Finland. The land of a thousand - presently ice-free - lakes is still teeming with waterfowl. Hundreds of Canadian Geese and swans have delayed their migration south. Additionally there are more White Wagtail, Meadow Pipit and Hen Harriers than usual according to Birdlife. However, there are fewer Fieldfares, Waxwings and Pine Grosbeaks than usual because they have difficulty finding food.
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Originally posted by Thebel
the Isabelline Shrike and Hume's Warbler - White Wagtail, Meadow Pipit and Hen Harriers , Fieldfares, Waxwings and Pine Grosbeaks
The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. Also, the longer days of the northern summer provide extended time for breeding birds to feed their young. This helps diurnal birds to produce larger clutches than related non-migratory species that remain in the tropics. As the days shorten in autumn, the birds return to warmer regions where the available food supply varies little with the season.
Originally posted by jeichelberg
I would not worry too much about our fine feathered friends...they know where their bread is buttered and seek to conserve energy if possible...
The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. Also, the longer days of the northern summer provide extended time for breeding birds to feed their young. This helps diurnal birds to produce larger clutches than related non-migratory species that remain in the tropics. As the days shorten in autumn, the birds return to warmer regions where the available food supply varies little with the season.
Plus, if they can continue to breed wherever they are at to propagate, they will...