From inoffensive to easily provoked, this poisonous "pit" viper can vary in size and temperament. Common characteristics of mature "rattlers" are a powerful body that can reach a length of 5.5 feet; a thin neck; a triangular, or heart-shaped head; facial pits; hooded eyes with elliptical pupils; and a tail rattle, often called "buttons." (caution: tail rattles can be lost or may not yet be present in young snakes). If threatened, the rattlesnake may coil, rattle, and raise its upper body, appearing ready to strike while actually backing slowly away with its lower body. However, if surprised, it may lunge up to several feet, striking without any warning behavior whatsoever. Not every strike delivers venom. Occasionally the snake will inflict what is called a "dry bite." Regardless, every rattlesnake bite needs medical attention.
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