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"Moccasins also like to rest upon low-hanging branchs and have been known to drop into your boat"

and for some unknown reason, they do not like where they have landed in your boat and will...

This may not be what you are asking for:

1. Know the water and the depth
2. Remember that snakes will also be out
3. Try to get to the water before it gets dark and memorize the territory so...