EUGENE M. MCCARTHY, PHD GENETICS
All images on this page are of a probable mallard/Canada goose hybrids (Anas platyrhynchos × Branta canadensis) or of mallards and Canada geese in their company. Other then the video above, all were photographed in Branch Brook Park, Newark, New Jersey on July 21, 2016 (specifically between Bloomfield Ave. and Park Ave.). The photos were taken by local resident Josephine Ireri and communicated by her husband Eric Martindale. They are used here with permission. Thanks!
Note that the Newark bird looks substantially different from the probable hybrid in the video above, taken in Athens, Georgia. Such variation occurs in hybrids both among F1 hybrids (in distant crosses) and in later-generation hybrids. The results of reciprocal crosses can also look substantially different.
Eric made the following comments about the Newark bird:
The parental birds in this cross come into potential breeding contact in both North America and Europe. Hybrids of this type were formally reported by ornithologist C. L. Sibley (1938), who says (p. 329) that he confines himself to records of hybrids “about whose authenticity there can be no doubt.”
This is an intersubfamilial cross (Anatinae × Anserinae).
By the same author: Handbook of Avian Hybrids of the World, Oxford University Press (2006).
Work cited: Sibley, C. L. 1938. Hybrids of and with North American Anatidae. IXe Congrès Ornithologique international (Rouen), pp. 327-335.
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