Texas Horned Lizard
The Texas horned lizard is one of about 14 North American species of spikey-bodied reptiles called horned lizards, all belonging the genus Phrynosoma. P. cornutum ranges from Colorado and Kansas to northern Mexico, and from southeastern Arizona to Texas. Also, isolated introduced populations are found in the Carolinas, Georgia, and Florida. Most records of the Texas horned lizard from the Piney Woods region of east Texas, Louisiana, and Arkansas are from the early and mid-twentieth century, a time when horned lizard were popular pets, and are thought to represent released or escaped pets and not the species natural range.
The horned lizard is popularly called a "horned toad", or "horned frog", but it is neither a toad nor a frog. The popular names come from the lizard's rounded body and blunt snout, which give it a decidedly batrachian appearance. Phrynosoma literally means "toad-bodied" and cornutum means "horned". The lizard's horns are extensions of its cranium and contain true bone.
The Texas horned lizard is the largest-bodied and most widely distributed of the roughly 14 species of horned lizards in the western United States and Mexico. The average Texas horned lizard is 69 mm (2.7 in) in snout-vent length, but the upper boundary for males is 94 mm (3.7 in) and for females it is 114 mm (4.5 in). Despite the fierce appearance, Texas horned lizards are extremely docile creatures. The Texas horned lizard is a sunbather, and requires bright sunlight to produce vitamin D. Deprived of sunlight, the animal is unable to produce vitamin D and can suffer from vitamin deficiency. So, horned lizards are most often found along the side of roads or other open, rocky areas, where they can lounge and take in sunlight. At night, the lizard buries itself in sand.
