Gopher snake

Large blotched non-venomous snake and the desert's great impersonator: cornered, it flattens its head, hisses, and buzzes its tail in dry leaves to fake a rattler — which gets a lot of innocent gopher snakes killed. Round pupils, no rattle, no fangs, quietly eating your rodents. The 'hard no' here isn't because it'll hurt you — it's because you'll think it's a rattler and lose your whole mind. Let it be.