The Western Diamondback Rattlesnake is a large, venomous reptile found in western states like California, Texas, and Arizona. It is brown to gray in color and blends into its rocky, desert habitat. It eats small animals like mice, lizards, and snake eggs using its venomous fangs. The Western Diamondback can live up to 20 years and females give birth to 10-20 babies after a 167 day gestation period.