All North American poisonous snakes (except the coral snake) have arrowhead shaped heads. That's the most reliable way to identify one that might hurt you. I grew up around em and even had a pet rattler when I was a teenager. Snakes are cool except moccasins. They're mean as snake **** and should be shot on sight!Ran into a few Puff Adders and thought they were rattle snakes...Scared the bee Jesus ought of me. The only thing missing was the rattle of the tail.