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A Survey of the Herpetofauna of the Comanche National Grasslands in Southeastern Colorado

Appendix 7:

Photographs of selected habitat and species of amphibians and
reptiles observered during the 1995-1997 field seasons


JPG -- Prairie rattlesnake
Prairie rattlesnake (Crotalus viridis viridis). This large male (>1000 mm) was found crossing Highway 160, which runs through the southern section of the Grasslands. Prairie rattlesnakes are commonly encountered on both sections of the Grasslands in most habitats. Note the typical defensive posture, with the head and forebody raised; snakes often retreat in this posture.
JPG -- Massasauga rattlesnake
Massasauga rattlesnake (Sistrurus catenatus edwardsi). Massasaugas are uncommon on the Grasslands, but are more frequently encountered further north. However, a new population we discovered in Baca County suggests that massasaugas may still be present in areas which have not been overly disturbed. Maximum adult length in Colorado is approximately 525 mm.

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