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This paper reports the first documented case of polymelia in a wild bird belonging to the order Anseriformes. A young male common teal (Anas crecca) was obtained in the autumn of 2012 near the settlement of Klyuchi (56.3° N, 160.8° E) in Central Kamchatka. The bird possessed a supernumerary hind limb attached to the caudal part of the pelvis, and the foot contained five toes.
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Gerasimov et al. (2026) studied this question.
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