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Table 1 Average Brown-headed Cowbird parasitism frequency on Red-winged Blackbird nests for three regions across North America based on a review of the literature

From: Egg rejection behavior does not explain the lack of cowbird parasitism on an eastern North American population of Red-winged Blackbirds

RegionNests examinedNests parasitized% ParasitizedRange (%)
West66583685.50.0–12.5
Central11,077188817.00.0–100
East10,7981861.70.0–8.3
  1. Data are compiled from studies in Appendix. See Appendix for definitions of the three regions