The Northwestern Neotropical Rattlesnake lives in Southwestern Mexico, with some staying at  Sierra de Coalcomán, reaching elevations up to 6,500 feet. It has a unique skin coloration and can grow around 3.2 feet in length. 

This type of rattlesnake is terrestrial and diurnal, feeding on rodents, birds, and lizards.

Crotalus culminatus syn. Crotalus durissus culminatus at the San Diego Zoo, California, USA