Comprehensive Description
provided by Smithsonian Contributions to Zoology
Pheucticus ludovicianus (Linnaeus)
A new northwesternmost record of this bird as a victim of the brown-headed cowbird is a parasitized nest found at Leduc, Alberta (Prairie Nest Records, Manitoba Museum); previously (Friedmann, 1963: 138) Saskatchewan and North Dakota were the only areas where this grosbeak was known to be parasitized by the northwestern race of the cowbird (M. ater atemisiae). In the files of the Ontario nest records, Toronto, are data on 193 nests, 12 of which (6.2 percent) were parasitized (by M. ater ater).
BLACK-HEADED GROSBEAK
- bibliographic citation
- Friedmann, Herbert, Kiff, Lloyd F., and Rothstein, Stephen I. 1977. "A further contribution of knowledge of the host relations of the parasitic cowbirds." Smithsonian Contributions to Zoology. 1-75. https://doi.org/10.5479/si.00810282.235
