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Drift is assisted by disorientating conditions such as mist or drizzle, and can result in large numbers of birds arriving together in an area in which they are not normally seen. In the UK this is called a fall, while in the U.S. it is known as a fallout, though in the latter case, it need not
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are blown off course by the winds while they are in flight. It is more likely to happen to birds heading south in autumn because the large numbers of inexperienced young birds are less able to compensate than the adults heading north in spring.
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93:"Bird orientation: compensation for wind drift in migrating raptors is age dependent"
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58:, leading to temporary concentrations of these species at headlands like
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Kasper Thorup; Thomas
Alerstam; Mikael Hake; Nils Kjellén (2003).
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An example would be an east wind in
September blowing
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83:
7:
14:
46:, and the continental race of
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19:is the phenomenon in which
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72:Reverse migration (birds)
50:onto the east coast of
31:involve vagrant birds.
109:10.1098/rsbl.2003.0014
97:Proc. R. Soc. Lond. B
103:(Suppl 1): S8–S11.
38:migrants such as
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17:Drift migration
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147:Bird migration
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36:Scandinavian
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40:bluethroats
78:References
21:migrating
141:Category
127:12952622
66:See also
56:Scotland
44:wrynecks
118:1698035
52:England
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60:Spurn
48:robin
24:birds
123:PMID
54:and
113:PMC
105:doi
101:270
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