Banded rock rattlesnake

Class: Reptilia
Order: Squamata
Family: Viperidae
Genus and Species: Crotalus lepidus
  • A gray snake with black-blotched stripes along its body, called a banded rock rattlesnake, rests with its head on its body in sand. It is nestled between branches and the arms of a green, cactus-looking plant
  • A gray snake with black-blotched stripes along its body, called a banded rock rattlesnake, slithers across a rock and branches
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Banded rock rattlesnake

The banded rock rattlesnake is a venomous species native to parts of the southern United States and Mexico. It is light gray with dark, gray-black bands along the length of its body.
Physical Description
The banded rock rattlesnake is a venomous species. It is light gray with dark, gray-black bands along the length of its body. This species is sexually dichromatic, meaning males and females differ in coloration. This snake's color variations are also dictated by subspecies and geographic location. 
Size

Banded rock rattlesnakes are a small- to medium-sized species, typically reaching 60 to 70 centimeters (23 to 27 inches) in length, though some males may exceed 80 centimeters (31 inches). Males tend to be larger than females.

The banded rock rattlesnake's range overlaps with that of the gray-banded kingsnake, a species similar in appearance with alternating gray and black bands along its body. This similarity is likely an adaptation that developed as a form of mimicry. Resembling a banded rock rattlesnake helps protect the nonvenomous gray-banded kingsnake from predators that may mistake it for the venomous banded rock rattlesnake.

Native Habitat

This species is native to the southern U.S. and Mexico, ranging from southeastern Arizona to western Texas and south through northern and central Mexico. 

It ranges across a variety of arid and semi-arid habitats, from grasslands and tropical deciduous forests to mountains, rocky flats and outcrops at elevations of 300 to 2,930 meters (1,000 to 9,600 feet). This animal can be found climbing into low vegetation or taking refuge under or among rocks, inside or under stumps, or in animal burrows.
 

Communication

As with other rattlesnake species, a banded rock rattlesnake will vibrate its tail when alarmed in an attempt to ward off potential predators. This rattling sound is created through the rapid vibration of a series of loose-fitting, interlocking scales on the tail. When vibration occurs, the edges of the scales rub against one another to create the characteristic sound of the rattlesnake.

Food/Eating Habits

Banded rock rattlesnakes prey on lizards, invertebrates, small mammals, birds and other snakes. They use venom to subdue their prey before swallowing it whole. The potency of the subspecies klauberi's venom varies throughout its range, suggesting that this snake's habitat and diet could be a factor in venom variations.

At the Smithsonian's National Zoo, banded rock rattlesnakes eat small rodents.

Reproduction and Development
Not much is known about banded rock rattlesnake reproduction. These snakes are thought to breed in the summer between late July and late August. Females may have between three and six young in a litter that average 21 centimeters (8 inches) in length.
Minor threats to these snakes include urban development, collection for the pet trade and habitat disruption due to mining activity. This species is common throughout its range and known to occur in protected areas, but population status in the wild is unknown.
The Smithsonian's National Zoo is home to two banded rock rattlesnakes of the subspecies Crotalus lepidus klauberi.
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