Geographical Variation in Bill Size across Bird Species Provides Evidence for Allen’s Rule
Author: Symonds, Matthew R. E..  Published in: The American Naturalist, v. 176  no. 2, pp. 188- 197  Date: 2010
ISSN:  0003-0147,  EISSN:  1537-5323  DOI:  10.1086/653666 
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