Amphisbaeni

Most amphisbaeni bear dark coloration in their scales, which ranges from sandy brown to mottled shades of deep green and black, the better to blend in with their environments,varying from deep temperate forests to the Southwestern United States. While they can be a disturbing sight to those who have never seen them before, the best measure is to move slowly, and carefully. Young amphisbaeni are only a few inches long when born, and are light brown, their skin darkening or lightening according to genetics and their environment. The oldest adult has been recorded at a length of 15.5 feet, with a girth of 2.5 feet. These reptiles can be found feasting on anything from insects to bird eggs, moles, and prairie dogs, moving to larger prey as they age. 

Perhaps one of the most curious aspects about them is their twin craniums. Just as in any creature with more than one head, amphisbaeni have a dominant and subordinate end, each with its own personality. Determined at the time of their hatching by which head emerges first, they rarely deviate from this order unless something occurs to sever one of the two heads. Should one become lost, the former neck will slowly grow into a tail over the course of several years, the vertebra and muscle developing slowly with each molt.

While they do not actively hunt humans or humanoid species, they are to be treated with caution nonetheless. Their venom, though fast-acting, is only mildly paralytic, causing stiffness of joints and drowsiness in those bitten. Regrettably, they are quite voracious when they first awaken from their hibernation in late spring, and won't hesitate to try taking down prey much larger than them.