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This is part two of a three-part series on Brown-headed Cowbirds/
Prairie birds often build domed nests on the ground and evolved methods of hiding nests so that cowbirds couldn’t find them. Cowbirds, in response, began watching females of other species; in that way they located nests. They also learned to time their visits when the intended victim was away from the nest. Recent studies have shown that in over 50 percent of cases, the cowbird removes an egg from a nest to be parasitized before laying her own egg.
As settlers moved west they cut down the forests and created the kind of habitat in which cowbirds thrived. Brown-headed Cowbirds moved east at man moved west.
Cowbirds also benefit from our modern manner of harvesting the grain on which cowbirds feed during the seasons when insects are not available. Machines, efficient as they are, allow for much waste. Cowbird flocks have increased with this abundance of winter food with the consequence that more and more females are searching out nests in which to lay their eggs.
May own experience with the cowbird tells the story. When I was
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