Allen's rule holds that animals in colder climates evolve shorter limbs to conserve heat. But within Europe wingspan seems to be somewhat dictated by height: groups that have been under positive selection for height per se (Balts, Dutch) have longer limbs.
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It's fairly well known that the Dutch are massive, after having lagged behind Britain for centuries. But the size of Balts is less known; recent improvements in nutrition have made Estonians bigger than Scandinavians.https://www.sciencedirect.com/science/article/pii/S0140673620318596#fig1 …
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Interesting. Who have the shortest wingspan?
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Milk consumption related?
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