Reptiles of the National Parks
Meet the 11 reptiles we've written up, like the American alligator, and the national parks where you'll find them.
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Reptile American alligator
Alligator mississippiensis
A big, armor-backed reptile that floats like a log in southern swamps and rivers, the top predator of the wetlands at Everglades and Congaree.
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Reptile Common chuckwalla
Sauromalus ater
Joshua Tree's largest lizard, a slow plant-eater that wedges into a rock crack and inflates its lungs so nothing can pull it back out.
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Reptile Common collared lizard
Crotaphytus collaris
A bright, big-headed lizard with two black neck bands that can sprint on its back legs like a tiny dinosaur across the slickrock at Arches and Canyonlands.
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Reptile Desert iguana
Dipsosaurus dorsalis
A pale, plant-eating lizard that stays out on the open sand at Joshua Tree in midday heat that sends every other lizard into the shade.
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Reptile Gila monster
Heloderma suspectum
A slow, heavy desert lizard covered in bead-like black and orange scales, one of the only venomous lizards in the U.S., found in the desert at Saguaro.
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Reptile Mojave desert tortoise
Gopherus agassizii
A slow, dome-shelled land turtle that digs long burrows to escape the desert heat, living in the Mojave country of Joshua Tree, Saguaro, and Death Valley.
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Reptile Northern Pacific rattlesnake
Crotalus oreganus
The only rattlesnake in these Northern California volcanic parks, born fully venomous but silent, with a single button instead of a working rattle.
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Reptile Sagebrush lizard
Sceloporus graciosus
A small, slender, high-country lizard, the fence lizard's cousin, whose males flash blue belly and throat patches in a push-up display.
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Reptile Southern alligator lizard
Elgaria multicarinata
A long, keeled-scale lizard that bites and holds on when grabbed, hunts black widow spiders, and can drop its tail and grow a new one.
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Reptile Western diamondback rattlesnake
Crotalus atrox
A big desert rattlesnake with diamond shapes down its back and a black-and-white "coon tail," most likely to be sunning near a trail at Big Bend or Saguaro.
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Reptile Western fence lizard
Sceloporus occidentalis
The blue-bellied lizard of West Coast rock walls and fence rails, whose blood carries a protein that kills the Lyme disease bacterium inside a feeding tick.