Patrick O'Meehan sent me this outstanding photograph he took of a cottonmouth in Post Oak Creek along the Post Oak Creek trail. Note the dark cheek stripe trimmed in white. The crossbands that display so prominently in this individual will fade into a solid dark color with age. This species eats nearly every variety of vertebrate available including frogs, reptiles, fish, birds, and mammals. Generally, these snakes are not aggressive, but if you are bitten you should seek medical attention immediately to minimize the damage to tissue and the very remote chance of death.