Sora (Porzana carolina) Parasitism of Red-winged Blackbird (Agelaius phoeniceus) Nests

Lawrence D. Igl


Sora (Porzana carolina) is a conspecific brood parasite that also occasionally parasitizes nests of other species. Sora parasitism in nests of passerines is rare. Of 129 Red-winged Blackbird (Agelaius phoeniceus) nests found in North Dakota in 2009 and 2010, two (1.6%) were parasitized by Soras. The conditions favouring this rare parasitic behaviour may include competition for nest sites and high Sora density.


Sora; Porzana carolina; Red-winged Blackbird; Agelaius phoeniceus; brood parasitism; North Dakota

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