Rattlesnakes are of the genus Crotalus, of the pit viper family Crotalidae, suborder Serpentes. Since snakes evolved from lizards, both groups make up the order Squamata. One of the larger species of rattlesnake common to the arid Southwest United States. From the sheer standpoint of size it ranks as one of the world's largest and most dangerous snakes. The diamondback primarily feeds on small rodents, rabbits, birds, and almost anything alive that can be swallowed whole Partly because of its wide distribution, this snake accounts for more serious and fatal snake bites than any other North American reptile.
Specimens exceeding six feet are rare.
The loud buzzing rattler sound coupled with a high rising and very threatening coil is usually ample identification information for those in the field. They are largely defensive and tend to stand their ground if provoked. A rattlesnake is classified as having hemotoxic venom that attacks the blood system of its prey. These serpents should be considered armed and dangerous with a well-developed fang and poison delivery system. The venome is of yellowish color.