The average size of an adult western diamondback rattlesnake is between 4 and 6 feet. Heftier snakes can weigh nearly 15 pounds, but the average weight is three to six pounds.

TUCSON, Ariz.— The U.S. Fish and Wildlife Service proposed today to protect 18,701 acres of critical habitat for narrow-headed garter snakes and 27,784 acres of critical habitat for the northern ...

TUCSON, Ariz.— The Center for Biological Diversity sued the U.S. Fish and Wildlife Service today for reducing critical habitat for two endangered snakes in Arizona and New Mexico by more than 90% from ...