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Old Thursday 5th December 2019, 20:32   #2
jurek
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Join Date: Aug 2003
Location: Switzerland/Poland
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Looks like a classic illustration of Allen's rule (animals in colder climate have shorter limbs) and Bergmann's rule (warm-blooded animals in colder climate are larger).
https://en.wikipedia.org/wiki/Allen%27s_rule
https://en.wikipedia.org/wiki/Bergmann%27s_rule

Note, that these well-known rules developed in the 19. century might not exist. So many animals don't conform to these rules or were not studied that the rules might be cherry picking.

But I wouldn't be surprised that the results may be e.g. due to habitat fragmentation (smaller size to survive in small habitat patches, and longer wings to search for patches of suiitable habitat).
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