Desert Tortoise
This tortoise is found only in the Mojave and Sonoran Deserts of North America, where it is endangered. It can live up to 80 years.
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Family: Testudinidae
Genus: Gopherus
Species: G. agassizii, G. morafkai
Common Names: Desert Tortoise, Agassiz’s Desert Tortoise, Morafka’s Desert Tortoise
Desert tortoises live in extremely hot environments, where temperatures can exceed 140 degrees Fahrenheit. They dig burrows to help shield them from the sun and the heat, and spend almost all of their time in their hollowed-out homes.
In the fall and winter months, tortoises will stay protected in their burrows in a dormant, hibernation-like state while the outside temperatures can get below freezing.
Other animals, including species of birds, reptiles, mammals, and even invertebrates can cohabitate a tortoise’s burrows. Rattlesnakes, quails, burrowing owls, beetles, spiders, scorpions, and squirrels are all known to share burrows with desert tortoises.
The desert tortoise is a plant eater, and is preyed upon by many animals, including ravens, badgers, coyotes and more.
After mating, tortoises lay four to eight eggs that look like ping pong balls. The eggs will incubate for three to four months before hatching. They have a very slow growth rate, taking up to 15 to 20 years before they reach mating age.
The desert tortoise can grow to lengths of 14 inches. Like most tortoises, it has a high-domed shell. Their shell shape gives them more space for lungs, which can help these cold-blooded reptiles keep a consistent internal temperature.
The desert tortoise is a member of the gopher tortoise group, which are named for their habit of digging burrows using their specially adapted, flattened front legs.
In 2011, DNA evidence showed that there were actually two distinct species of desert tortoise, with one (G. agassizii) living west of the Colorado River, while the other (G. morafkai) lives east of the Colorado River.
The desert tortoise is the state reptile of two states: California and Nevada.
Desert tortoises are considered Critically Endangered, and face many threats including habitat destruction, illegal collection, and loss of food source due to invasive plant species. Off-road vehicles also harm tortoises, either by directly striking them, or inadvertently ruining burrows or crushing tortoise eggs.
In some areas, their populations have suffered as high as 90% reduction over the past 30 or 40 years.