Prairie Rattlesnake
Crotalus viridis

Size:  3 - 4 ft
Western 1/3 to 1/2 of state.  The prairie rattlesnake, or western rattlesnake, prefers large open prairies littered with cover. Its principle diet consists of the black-tailed prairie dog and utilizes prairie dog burrows as a retreat from danger and high temperatures. Although it is extremely toxic, the prairie rattler is not known for aggression and will retreat when given the opportunity.