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September 1, 1969Evolution

Ecotypic Variation in the Non-Breeding Season in Migratory Populations: A Study of Tarsal Length in Some Fringillidae

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SFStephen D. FretwellBucknell University

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Stephen D. Fretwell (1969) studied this question.

synapsesocial.com/papers/6a89a4b2d89205768aeb3e12https://doi.org/10.1111/j.1558-5646.1969.tb03524.x
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