It is not found in Mexico, and only a single small population is found in Canada. In Texas, Crotalus horridus is found only in the wetter portions of the eastern quarter of the state. Across much of its range, C. horridus is protected from collection by state regulations. Texas is no exception, and the Timber Rattlesnake is classified as a threatened species by the Texas Parks and Wildlife Department and is fully protected under the law. This project funded by the University of Texas College of Natural Sciences and the Texas Memorial Museum .
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