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Nerodia rhombifer rhombifer
Nonvenomous Status Extremely common in Katy and Cypress Texas Description/Identification This is a very large bodied snake usually found near water.  Adults can reach weights and lengths much larger than other water snakes in the area.  Has round pupils and the eyes are further forward on the head than most other water snakes.  Coloration is typically a combination of grey, black, and yellow.  I have seen adults with a greenish or orange coloration as well.  Juveniles look just like smaller versions of adults. Defense The first defense for this snake is to flee.  If unable to flee they will flatten their body and head to appear larger and to give the head an arrow shape (which many humans incorrectly associate with the snake being venomous).  If touched or restrained by a human the snake will emit a foul smelling musk and twist around while spraying feces onto whatever is restraining it.  This snake may bite or make open mouth strikes without biting.  After a strike or two water snakes typically calm down and stop striking if the aggressor is not attempting to kill them.  The bite will draw blood but is typically not much more than a scratch that heals within a few days.
(Diamondback Water Snake)