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Cabeza Prieta Natural History Association
Sonoran Desert Reptiles
Crotalus molussus (Blacktail rattlesnake)



 Blacktail rattlesnake

Diet: rodents, birds, lizards

Identification: 28 - 54 in. (71-137 cm). Tail and sometimes snout black, contrasting with rest of body. Tail sometimes gray with vague rings. Back with black or brown blotches or cross bands of irregular outline, each edged with whitish and having a single or double patch of light scales at center. Dark markings toward front and middle of back sometimes diamond-shaped. Scales in patterns areas usually one color, not partly dark and light. Enlarged scales on the upper surface of snout. Scales keeled, in 27 rows. Young: Dark rings visible on tail. Eats birds, and lizards.


Excerpts from A FIELD GUIDE TO WESTERN REPTILES AND AMPHIBIANS, 3/e by Robert C. Stebbins. Copyright (c) 2003 by Robert C. Stebbins. Reproduced by permission of Houghton Mifflin Company. All rights reserved.

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Natural History of the Sonoran Desert and Refuge