The 67 species of alligator lizards range throughout the world. The ones common to North America, the Gerrhonotus , includes 15 species ranging from southern Canada down through Central America. The different species range through a variety of habitats, generally frequenting moist areas of foothills and mountains, but also found ranging down into the drier grasslands, staying near rivers and streams. Secretive in nature, they hide under windfall, undergrowth, and in rocky crevices. Pugnacious when caught, they will thrash around, often delivering a painful bite.
Alligator lizards sport a flat, wedge-shaped head.
There is little neck definition, with the body about the same width as the head. The legs are small, thin, and end in five fine toes. Notable is a distinct lateral fold running along their lower sides from the corner of their mouth to their tail. Their scales are large, slightly keeled, and shingled. Ground color is pale to medium brown with darker crossbands.