The western diamondback rattlesnake or Texas diamond-back (Crotalus atrox) is a venomous rattlesnake species found in the southwestern United States and northern Mexico. It is likely responsible for the majority of snakebite fatalities in northern Mexico and the greatest number of snakebites in the U.S. No subspecies are currently recognized. It lives in elevations from below sea level up to 6,500 feet (2,000 m). This species ranges throughout the southwestern United States (Arizona, California, Colorado, New Mexico, Oklahoma and Texas) and northern half of Mexico. Currently, western diamondback rattlesnakes are neither threatened nor endangered.
- It played African Rock Python in The Grizzly King II: Simba's Pride
- It played Grizz in We Bare Venomous Snakes and We Bare Venomous Snakes: The Movie
- It played Bubbles in The Powerpuff Elapids, The Powerpuff Elapids Movie, and The Powerpuff Elapids (2016)
- It played HIM in The Powerpuff Rodents and The Powerpuff Rodents (2016)
- It played Leonardo in Teenage Mutant Ninja Reptiles
- It played Emma (Mermaid) in Mako Desert Animals, Mako Mexican Animals, and Deserts: Just Add Animals
- It played Ekans in Pokemon (Samwei1234 Version)
- It played Lyla (Mermaid) in Mako Snakes, Mako North American Reptiles, and North America: Just Add Reptiles
- It played Nixie (Mermaid) in Mako Elapids and Mako Southwest Animals
- It played Randall in Reptiles, Inc.