Banded rock rattlesnake | Smithsonian’s National Zoo and Conservation Biology Institute https://nationalzoo.si.edu/animals/banded-rock-rattlesnake
The banded rock rattlesnake is a venomous species native to parts of the southern United States and Mexico. It is light gray with dark, gray-black bands along the length of its body.
Species: Crotalus lepidus Animal News Giant Pandas