Very nice photos. I used to live in the south. I do not miss water moccasins..those are some mean snakes
Cottonmouth, rattlers, and copperheads all have a similar thick body and then the neck that narrows down, and a wide head.  Once you notice it, it is easy to spot in the wild.   Other (north american) snakes have a more narrow body with a slow taper into a narrow head.

Here in Nor. California we get these critters all the time. I usually catch and release them several miles away:

Looks like I am going to have to create a mastodon account for testing this sort of issue.
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