An Arizona Black Rattlesnake found in mid-elevation oak woodland near Tucson. This species of rattlesnake can change color in a relatively short amount of time, often appearing much lighter and heavily patterned at night, and transitioning to this inky black in the light. Other factors, such as social interactions and mood may also affect this shift.

These snakes are highly prized by collectors and quite a few leave this particular area in bags each year, often headed for illegal breeding and sale elsewhere in the US.