The Western diamondback rattlesnake is a large venomous snake found primarily in the southwestern United States and parts of 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, although most are around 4 to 5 feet. 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.