When I was camping in the Sawtooth Mountains in Idaho, I saw a yellow rump feeding an almost adult-size immature cowbird that was out of the nest but just hopping along the branches. The cowbird was at least four times larger than the yellow rump.


This morning I saw a male common yellowthroat feeding a large immature cowbird that was fluttering from branch to branch.


How long do the warblers feed the cowbirds?

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