Here I report the first case of double brooding in a Swainson's Warbler (Limnothlypis swainsonii). On 7 June 2002, I observed a color-banded female feeding an 8-day-old fledgling 20 m from her first nest. On 12 July 2002, I saw the same bird feeding a banded 12-day-old fledgling 8 m from her second nest. Double brooding is one strategy by which a genotype may increase genetic representation in future generations.
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