The western diamondback rattlesnake is a venomous snake found primarily in the southwestern United States and northern Mexico. It is easily recognized by its distinctive diamond-shaped patterns along its back, which can vary in color from gray to brown. This species can grow up to 7 feet long, making it one of the larger rattlesnakes. These snakes are known for their characteristic rattle at the end of their tails, which they use as a warning signal when threatened. The western diamondback primarily feeds on small mammals, birds, and lizards, using its heat-sensing pits to locate prey.