dichotomous key
1.a.. Bumps on the body-------------------------------------------------------------------Woodhouse toad
1.b. No Bumps on the body---------------------------------------------------------------Go to 2
2a.. Smooth skinned------------------------------------------------------------------------Go 3
2b. Red dots on the skin-------------------------------------------------------------------Red-spotted toad
3a.. Smooth skin with stripes -------------------------------------------------------------Tiger salamander
3b. Smooth skinned with spots------------------------------------------------------------Great Plains toad
1.b. No Bumps on the body---------------------------------------------------------------Go to 2
2a.. Smooth skinned------------------------------------------------------------------------Go 3
2b. Red dots on the skin-------------------------------------------------------------------Red-spotted toad
3a.. Smooth skin with stripes -------------------------------------------------------------Tiger salamander
3b. Smooth skinned with spots------------------------------------------------------------Great Plains toad
References "Petrified Forest National Park."Wikipedia. Wikimedia Foundation, 24 May 2014. Web. 25 May 2014. <http://en.wikipedia.org/wiki/Petrified_Forest
United States. National Park Service. "Petrified Forest National Park (U.S. National Park Service)." National Parks Service. U.S. Department of the Interior, 11 May 2014. Web. 25 May 2014. <http://www.nps.gov/Pefo/Index.htm>.
United States. National Park Service. "Petrified Forest National Park (U.S. National Park Service)." National Parks Service. U.S. Department of the Interior, 11 May 2014. Web. 25 May 2014. <http://www.nps.gov/Pefo/Index.htm>.