Phenotypes of juvenile offspring of a mixed pair consisting of a male House sparrow and a female Tree Sparrow Passer spp.
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Cordero, P. J. (1990). Phenotypes of juvenile offspring of a mixed pair consisting of a male House sparrow and a female Tree Sparrow Passer spp. Ornis Fennica, 67(2), 52–56. Hämtad från https://ornisfennica.journal.fi/article/view/133300