Photo credit:

Rob Schell

Common name

Isla San Esteban Rattlesnake

Scientific name

Crotalus estebanensis

Conservation Status

Least Concern

Federal and State Protections


Countries of Occurrence


States or Providence 



Hermosillo Municipality

Adult size

35in (98cm)

Species Description

This medium-sized rattlesnake is unique to Isla San Esteban in the Gulf of California. It was previously considered a subspecies of the Black-tailed Rattlesnake (Crotalus molossus) but was elevated to full species status in 1999.
It thrives in xeric thornscrub and rocky hillsides on the island.

Subscribe for Updates

Jacksonville, FL |  |  1-800-690-5638

  • Facebook Social Icon
  • Twitter Social Icon
  • Instagram Social Icon

© 2019 The Rattlesnake Conservancy, 501(c)(3) corporation