Reptiles of Big Bend

NPS/R. Wonite

Reptiles

Big Bend's desert environment is a perfect place for reptiles. A reptile's cold-blooded or, more accurately, "ectothermic" metabolic rate is very low, but so are its energy needs. Since keeping warm in the desert does not require much work, reptiles are well adapted to this part of Texas. Energy that is generated is used for reproduction and finding food, rather than being wasted in heating and cooling.

 

Texas spiny softshell turtle

NPS/M. Landis

Turtles

Turtles are characterized by a special bony or cartilaginous shell developed from their ribs that acts as a shield. There are only a few wet places in the park where turtles can be found. However, in the summer rainy season it is possible to find one in desert areas, wandering between wet spots. Big Bend National Park supports six species of turtles.

 

Eastern collared lizard

NPS/J. Jurado

Lizards

Lizards are a widespread group of reptiles, with over 6,000 species, ranging across all continents except Antarctica. Big Bend is home to twenty-two species of lizards. These quick creatures are often heard but not seen as they scurry through the vegetation to the side of a trail. Those that are sighted are fast and fit easily into small hiding spaces.

 

Black-tailed rattlesnake

NPS/C. Ballou

Snakes

Thirty-one species of snakes, including four species of rattlesnakes, inhabit Big Bend. Snakes may be more active after summer rains. Keep in mind that all wildlife, including snakes, are protected in the park. Please do not harm, handle or otherwise disturb them.