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kimerajamm
Joined: 28 Nov 2010
Posts: 416
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 Although both colour |
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Although both colour morphs occur in much of the European range, brown birds predominate in the more humid climate of western Europe, with the grey phase becoming more common further east; in the northernmost regions, all the owls are a cold-grey colour. Siberian and Central Asian subspecies have grey and white plumage, the North African race is dark grey-brown, and South and East Asian birds have barred, not striped, underparts, and fine lines around the facial disc. The Siberian and Scandinavian subspecies are 12% larger and 40% heavier, and have 13% longer wings than western European birds,[10] in accordance with Bergmann's rule which predicts that northern forms will typically be bigger than their southern counterparts.[14]
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tannlege
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| Thu Apr 21, 2011 2:34 pm |
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