Lizards are cold-blooded reptiles who need the sun to keep them warm. Hence they are often easy to spot while basking on rocks.
The Collared Lizard has a large head and distinctive coloring, especially on the males.

The males of the subspecies found in western Colorado have bright yellow heads.


These lizards are generally quite tolerant of humans.

They are well-known for their ability to run on their hind legs, making them look like tiny dinosaurs.
The Side-blotched Lizard, with its distinctive rough tail, is one of the most abundant and commonly observed lizards in the deserts of western North America.

Plateau Side-Blotched Lizards tend to be less colorful than other subspecies.


These lizards have a dark spot on each side of the chest.