Why Are Cowbirds a Particular Problem for Kirkland's Warblers

question 48

Multiple Choice

Why are cowbirds a particular problem for Kirkland's warblers?

• A) The cowbirds have only recently started parasitizing the warbler nests, so they haven't had time to adapt yet, and the warblers are rare to start with.
• B) The cowbirds bring bison into warbler territory, and they tend to trample the warbler nests because they're on the ground.
• C) Cowbird eggs look a lot like warbler eggs, so the warblers don't recognize they aren't their own.
• D) Warblers and cowbirds prefer the same sort of habitat.
• E) Kirkland's warblers tend to get stuck in traps designed for the cowbirds.

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