There are only three species of venomous snakes that live in Iowa and all of them are endangered or threatened in that state, so I never really had to worry about them before. Now that I've moved to Texas, I do have to worry about them. Venomous snakes are just as common here as the nonvenomous ones. In fact, the only snake I've seen so far was venomous. I think it might have been a cottonmouth, but it was getting dark and hard to be sure.
I can't identify which species of snake I'm looking at yet, but I do know how to tell if they are venomous or not. Most people know to look at the shape of its head. Venomous snakes have a more diamond shaped head while nonvenomous snakes have a rounder head.
But there are exceptions to that rule. So you have to look at a few other things to know for sure. Nonvenomous snakes have round pupiled eyes, a curved "nose," and larger scales on their head.
The Venomous snakes have slit pupils (like a cat), a pointed "nose," and small scales on their head
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