The Diamond-back (or backed) Water Snake is a long, heavy-bodied, tan to gray-brown snake with a pattern of dark brown to black chain-like markings. The belly is yellow, but with dusky brown markings. As the name implies it lives in slow moving waters and is found all over Louisiana. These beautiful snakes eat fish, frogs, and a few birds. Plus it is a non-venomous/ non-poisonous snake. But the bite will still hurts.