Changes in farming practices have created distress for some bird species. Some farmers are now using land once set aside for conservation to plant more corn for use as ethanol. And the disappearance of smaller family farms in favor of larger corporate farms has led to the disappearance of hedgerows -- fences of trees or bushes that reduce erosion and lessen the force of the wind on crops, and at the same time serve as protection and nesting areas for many grassland birds.
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