http://alienexplorer.com/ecology/e32.html

http://www.cnr.colostate.edu/class_info/f311/leopold.htm

http://www.islandpress.com/ford/X16.html

http://www.jacoblake.com/m-wildlife.html

http://www.bio.swt.edu/simpson/techniques/

http://www.defenders.org/wildlife/wolf/predfact.html

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Last modified: 8 May 2001; Created: 8 May 2001