At higher elevations, such as the Davis Mountains in Jeff Davis County, the background colors are generally more yellowish, which contrast more strongly with the dark vertebral blotches and allow the rattlesnake to camouflage itself more effectively in the shadows created by the pinon-juniper woodland. The Blacktail Rattlesnake eats a variety of vertebrate prey, feeding on mammals, birds and even lizards. Crotalus molossus is found in Arizona, New Mexico, and Texas. In Texas, C. molossus is mostly found throughout the rocky areas of the trans-Pecos, but has also occurred historically eastward to the edges of the Edwards Plateau, including Bandera and Travis Counties. This project funded by the University of Texas College of Natural Sciences and the Texas Memorial Museum .
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