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Photo credit:

Halla Mayoral C Sebastián

Common name

Oaxacan Blacktail Rattlesnake

Scientific name

Crotalus molossus oaxacus

Conservation Status

Least Concern

Federal and State Protections

Range Map


Countries of Occurrence


Adult size

100cm (39.3in)

States or Providence 



Species Description

This large rattlesnake only occurs in the Mexican states of Oaxaca and Puebla in a variety of habitats including desert, mesquite grassland, and pine-oak forests. They are relatively calm and docile snakes, but their venom is not to be underestimated. Their diet primarily consists of small mammals and birds. The Oaxacan black-tailed rattlesnake can be quite variable in coloration, ranging from dark brown to golden yellow.

This subspecies used to be regarded as being under the Mexican west-coast rattlesnake (Crotalus basilicus)--the morphological similarities are very close! However, genetics placed this subspecies where it currently stands today under the western black-tailed rattlesnake (Crotalus molossus).

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