List of reptiles of Yellowstone National Park

Painted turtles can be found in rivers and lakes along the northern edge of the park.

The bullsnake (Pituophis catenifer sayi) is a large non-venomous colubrid snake, widespread in the part of the United States, northern Mexico, and southern Canada.

It is found at lower elevations, drier, warmer climates, and open areas such as near Mammoth Hot Springs.

It is often mistaken for a rattlesnake because of its appearance and its defensive behavior; when disturbed it will coil up, hiss loudly, and vibrate its tail against the ground, producing a rattling sound.

In Yellowstone this snake is infrequently encountered in due to its nocturnal and burrowing habits.

It is usually found in rocky areas near streams or rivers, with shrubs or trees nearby.

It belongs to the genus Sceloporus (spiny lizards) in the Phrynosomatidae family of reptiles.

It is most common along the lower portions of the Yellowstone River near Gardiner, Montana and upstream to the mouth of Bear Creek.

It eats small rodents, fish, frogs, tadpoles, salamanders, earthworms, slugs, snails, and leeches.