A pretty little Arizona Ridgenosed Rattlesnake from a humid week in southeastern Arizona.

A pretty little Arizona Ridgenosed Rattlesnake from a humid week in southeastern Arizona.

New Mexico Ridgenosed Rattlesnake (Crotalus willardi obscurus) from a survey several years ago.

Arizona Ridgnosed Rattlesnakes are common in a few mountain ranges in southeastern Arizona, but not found in the desert environments where most people live. They are usually seen by hikers and wildlife observers in the daytime, but often found moving at night as well.

An Arizona Ridgenosed Rattlesnake in southeastern Arizona. These small rattlesnakes are found in bunchgrass and oak leaf litter at elevations above around 4,500′. Though they may be locally abundant, most of the long-term locals asked in the area about them have no idea it exists.

Buontempo, M. J. (2024). Evolutionary history of a specialized and diverse highland snake complex (Crotalus willardi) (Doctoral dissertation, University of Texas at El Paso). https://scholarworks.utep.edu/cgi/viewcontent.cgi?article=5226&context=open_etd
New Mexico Ridgenosed Rattlesnake, Crotalus willardi obscurus. This adult was found in high-elevation woodland in northern Mexico.

An Arizona Ridgenosed Rattlesnake found in bunchgrass on a perfect, overcast day in the Arizona sky islands.

New Mexico Ridge-nosed Rattlesnake, Crotalus willardi obscurus

An Arizona Ridgenosed Rattlesnake from the southeastern corner of the state. This is also our state reptile.

Quiz time: This subspecies of ridgenosed rattlesnake is only found in Arizona and Mexico. There are two other rattlesnakes that are also only found in Arizona and Mexico. What are they?
An Arizona Ridgenosed Rattlesnake we saw after dark in southeastern Arizona. These small snakes are great at hiding, and the locals rarely even know they exist.

An Arizona Ridgenosed Rattlesnake in southeastern Arizona. These small rattlesnakes are common where they are found, but even ranchers born and raised in the area usually have no idea it exists. That’s thanks, in part, to its nearly perfect camouflage, making it about invisible in oak leaf litter and bunchgrass.
