A 4-Foot Snake Killed by a Hiker Turned Out to Be Something Scientists Had Never Seen Before

"This particular individual, feeling threatened, remained motionless, mimicking one of the branches of the shrub it was on." ...
AZ Central

Here's the most venomous snake in Arizona, plus 13 other species to avoid

Arizona has 13 species of rattlesnakes and one coral snake species. Snakes are most active from March to October. Rattlesnakes have distinct features like a triangular head and vertical pupils.