Northern Prairie Wildlife Research Center
Figure 16. The cone-shaped sheet-metal predator guard offers protection from ground predators such as raccoons to cavity nesters using nest structure.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/nestbox/predblu.htm
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Menlo Park, CA [caww54]
