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Central North Dakota. A uniform line of trees stand like a wall firming up a boundary line between cropfields and neighboring farms in eastern North Dakota. Such shelterbelts, many planted generations ago on small family farms, were often planted by design to act as windbreaks to cut down on soil erosion and today in many heavily farmed areas provide the only remaining protective cover or travel lanes left for both mammals and birdlife. Each year, more shelterbelts are cut down and graded over to make way for a row or two more of cropland.