Photo credit:

(unedited) by helado on iNaturalist

Common name

Midget Faded Rattlesnake

Scientific name

Crotalus oreganus concolor

Conservation Status

Federal and State Protections

Countries of Occurrence

States or Providence 


Adult size

Species Description

This relatively small-sized rattlesnake is only found in the Colorado and Green River basins of Wyoming, Utah, and Colorado in the United States. This species generally stays under 3 ft long. Juveniles of the midget faded rattlesnake are typically distinctly patterned, and the pattern tends to fade to a silver or gray as the snakes age. This species exhibits an ontogenetic shift in prey type (favoring lizards or shews over larger rodents) but not a shift in toxicity; venom of juvenile midget faded rattlesnakes are just as toxic as adults of this species.

Fun fact: The midget faded rattlesnake possesses venom more toxic than most other rattlesnakes and any other subspecies under Crotalus oreganus. This is due to a neurotoxin, concolor toxin, as well as a potent mytotoxin.

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