Mallards (Anas platyrhynchos) typically hatch no more than one nest per year. Herein, we document two cases of re-nesting by radio-marked mallards after hatching a nest earlier in the breeding season in northern Ohio during 2001. One radio-marked female hatched 13 eggs during her first nesting attempt and, subsequently, lost her brood. She then initiated a second nest that was later depredated during incubation. A second radio-marked female hatched 11 eggs during her first nesting attempt and, after losing her brood, initiated a second nest, hatched 5 eggs and reared her second brood to fledging. Double brooding may be associated with age of the female (AFY), early nest initiation date, loss of initial brood and breeding season length.
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Vol. 150 • No. 2