Links:

www.biopark.org/Clepidus.html

www.rattlesnkes.com/snakes/snake17.html

http://www.fw.vt.edu/fishex/nmex_main/species/030174.htm

www.geocities.com/jqjacobs/southwest/rattlesnake.html

www.tsha.utexas.edu/handbook/online/articles/view/RR/tdr1.html

www.venomousreptiles.org/pages/msklauberi.jpg

www.sloanmonster.com/rattle.htm

www.thesnake.org/vipers.html

Books:

Ernst, Carl H. Venomous Reptiles of North America. Smithsonian Institution Press. Washington & London. 1990. Pgs.118-23.

Klauber, Laurence M. Rattlesnakes.Their Habits, Life Histories, & Influence on Mankind. University of California Press. Berkeley, Los Angeles, & London. 1989. Pgs. 9, 21, 108, 264.