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Cowbird Chicks' Super Necks Steal Foster Parents' Food
9 Apr
Summary
- Brown-headed cowbird chicks have stronger neck muscles.
- Their necks help them beg for food longer than nestmates.
- This adaptation ensures they receive more nourishment.
Brown-headed cowbird chicks have developed a remarkable evolutionary advantage: stronger neck muscles. This adaptation allows them to hold their heads up and beg for food for extended periods, outcompeting their foster siblings.
New research, comparing cowbird chicks to prothonotary warbler chicks, revealed that cowbirds can hold their heads up for an average of five seconds, more than double that of warblers. This ability ensures they receive a greater share of the food provided by the unsuspecting host parents.
The parasitic nature of brown-headed cowbirds means they lay eggs in other birds' nests. Their chicks hatch quickly, typically within 10-11 days, and possess loud calls and rapid growth, further aiding their survival. The enhanced neck strength is the latest discovered advantage in their strategy.
These small, omnivorous birds inhabit temperate regions of North America and migrate south for winter. Their diet consists of seeds, fruits, and small insects. Female cowbirds lay up to 40 eggs per season, relying on other species to raise their young.
