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Alexander Lees
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Long-tailed Shrike (Lanius schach),
By the examination of trends in "vagrany events" we may be able to discern evidence for:
a) the diagnosis of new migration routes/wintering areas/range expansions
b) population changes within a species' breeding range
c) explaining the observed distribution of species on oceanic islands
d) a more holistic understanding of orientation mechanisms

Yellow-browed Warbler (Phyloscopus inornmatus), UK; White-rumped Sanpiper (Calidris fusicolis), Brazil; Fork-tailed Flycatchers (Tyrannus savana), Brazil; Snowy Owl (Bubo scandiaca), UK.
All Photos © Alexander Lees
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