You guys will like this story. Many years ago, SWMBO and I were constructing a small footbridge over a creek on our property -- which, yes, is in Florida. Basically, dig 4 post holes, drop in 4 posts, hang some structure onto the posts, add ramps to the ground at both ends. So I'm using a post hole digger a few feet from this creek, and as soon as I dig deep enough the bottom of the hole starts to fill in with water. Then the water is moving! It turns out there are little baby snakes swimming around in it. We just dropped in the post and filled in the hole and carried on. We nicknamed that bridge "Baby Snake Bridge", though.