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Nerodia erythrogaster transversa
Nonvenomous Status Common in Katy and Cypress Texas Description/Identification This is a large bodied snake usually found near some type of water.  Identifiable by round pupils and blotched pattern on its back.  Young are more lightly colored and they darken with age as seen below.  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.
(Blotched Water Snake)