Related Links

Conservation Magazine: DNA Stop Sign?
http://www.conservationmagazine.org/2010/10/dna-stop-sign/

U.S. Department of Transportation: Critter Crossings
 http://www.fhwa.dot.gov/environment/wildlifecrossings/intro.htm

Fragmentation of Nature by Roads and Traffic and Its Defragmentation
 http://books.google.com/books?id=zL7J3g6MhtkC&pg=PA233