| Abstrakt: |
American goldfinches, house finches, and northern cardinals were allowed to feed, but blue jays, blackcapped chickadees, tufted titmice, and white-breasted nuthatches were being driven away. Since pewees feed on insects, and (at least in part) so do the blackcapped chickadees, tufted titmice, white-breasted nuthatches, and blue jays, the ones that your pewee was attacking, perhaps it recognized those birds as potential competitors for insect food resources. American goldfinches, house finches, and northern cardinals are primarily seed eaters, and therefore not competitors for the pewee's food. [Extracted from the article] |
