September 22, 2020
AZ Animals Staff
Desert Tortoise Facts:
Distinctive Feature: Small size and patterned shell
Habitat: Sandy desert plains and rocky hills
Favorite Food: Grasses
Average Clutch Size: 7
Slogan: Lives in burrows underground!
Desert Tortoise Physical Characteristics:Colour: Black, Brown, Tan, Yellow
Skin Type: Scales
Top Speed: 0.3 mph
Lifespan: 25 - 60 years
Weight: 4kg - 7kg (8lbs - 15lbs)
Length: 25cm - 36cm (10in - 14in)
“A desert tortoise can live to be over 80 years old!”
Desert Tortoise Summary
Desert tortoises are found in the United States and in Mexico. These tortoises burrow tunnels so they can go underground to cool off when the desert heat gets to be too much. The California desert tortoise eats grasses, flowers and herbs found in their hot, dry environment. These reptiles dig grooves in the sand with their feet to catch rainwater to drink.
Desert Tortoise Top Facts
• Bouncing baby tortoises: The eggs laid by a tortoise are the size of ping-pong balls.
• A thirsty tortoise: After drinking rainwater, a tortoise may go as long as a year without needing more water.
• Life in a tunnel: A desert tortoise spends about 95% of life inside tunnels beneath the sand.
Desert Tortoise Scientific Name
Desert tortoise is the common name for this reptile and Gopherus agassizii is its scientific name. This tortoise belongs to the Testudinae family and its class is Reptilia. There is another species of desert tortoise with the scientific name Gopherus morafkai. It has a shell that’s narrower in shape than the Gopherus agassizii. Gopherus refers to the burrowing habits of this tortoise. They burrow into the ground just as actual gophers do. Agassizii is in the turtle’s name to honor Swiss zoologist Jean Louis Rodolphe Agassizii who spent many years studying tortoises in North America.
Desert Tortoise Appearance & Behavior
The shell of a desert tortoise is usually brown or gray without any colorful markings on it like you would see on a Box turtle you might find in the woods. It does have a pattern of lines that separates the shell into sections, or scutes. The underside of its shell is yellow or light brown.
This tortoise can be from 8 to 15 inches long and 4 to 6 inches tall. If you put a desert tortoise on a scale it would weigh from 8 to 15 pounds. A tortoise weighing 8 pounds would weigh the same as half a bowling ball! The largest desert tortoise on record is 17 inches long and weighs 26 pounds. His name is Monster!
Desert tortoises have small black eyes and ears that cannot be seen from the outside. They have an eardrum located on their neck under a layer of scales. A desert tortoise feels the ground vibrating and those sounds move up through their legs, shell and into their eardrums. That’s how they hear what’s going on around them.
Whether it’s burrowing a tunnel to live in or creating a groove in the sand to catch rainwater, these tortoises do a lot of digging! They have strong front legs with sharp, sturdy nails on them that help them to make a lot of progress when breaking through the dry ground. Their scaly skin protects them from the heavy digging work they do.
A desert tortoise has a large shell with plenty of space for its lungs. Plus, its roomy shell helps this reptile to keep its body temperature normal so it can adapt to the extreme heat in the desert.
The way a desert tortoise stores water helps it to live in a hot, dry environment. After taking a big drink of rainwater, a desert tortoise can store extra water in its bladder to use whenever it needs some.
Desert tortoises like to live alone except during breeding season. However, sometimes these solitary reptiles share a tunnel with a dozen or more other tortoises especially during the wintertime. When tortoises do form a small group, it’s called a creep. Desert tortoises are shy animals making it hard for scientists and wildlife photographers to catch a glimpse of them.
Desert Tortoise Habitat
Desert tortoises live in the southwestern part of the United States and the northwestern part of Mexico. Specifically, they live in the Mojave and Sonoran deserts. This desert environment has temperatures that sometimes go a lot higher than 105 degrees Fahrenheit and there’s very little rainfall.
The Sonoran and Mojave Desert tortoise survives this very hot climate by going down into tunnels during extremely hot summer weather. In fact, they go into a type of hibernation called estivation. In the summertime, desert tortoises sleep a lot to save their energy!
In the wintertime, the grasses that desert tortoises eat become very scarce. So, these reptiles move into their tunnels and go into another type of hibernation called brumation. But, when springtime arrives, desert tortoises move out of their tunnels into the sunshine to eat!
Desert Tortoise Diet
What does a desert tortoise eat? A desert tortoise eats rice grass, Bermuda grass, rye grass, primrose, sow thistle, cactus and wildflowers. This reptile walks slowly across the desert using its scaly, tough feet to pull dry grass out of the ground. It takes a tortoise about 20 to 30 days to digest its food!
In the wild, a desert tortoise knows what plant life to eat to survive. However, some tortoises become sick and die from eating trash left behind by humans. Balloons, plastic bags and food containers are examples of items that are harmful to these reptiles.
Desert Tortoise Predators & Threats
Coyotes, skunks, ravens, foxes and Gila monsters are all predators of the desert tortoise. These predators are likely to go after younger, more vulnerable tortoises. A desert tortoise hides in its shell or in one of its tunnels to escape a predator. Also, if it’s picked up in the mouth of a predator, it releases urine in order to make the animal let go of it. This may help the tortoise to escape the predator’s grip, but releasing urine means the tortoise has less water to drink. This can put the tortoise at risk especially during the hot summers in the desert.
The conservation status of the desert tortoise is: Threatened. Desert tortoises are losing some of their habitat to humans who are building neighborhoods and creating more landfills in the area. Also, the tortoise is at risk when it crosses roads where vehicles travel.
Desert Tortoise Reproduction, Babies & Lifespan
Male desert tortoises compete with each other for the attention of a female during breeding season. One male may even push another over onto its shell to prove its strength.
The gestation period of a female desert tortoise is 3 to 4 months. She digs a nest and can lay up to 14 eggs. After laying the eggs, the female tortoise leaves them. Eggs are laid between May and July and hatch between August and October.
Once the eggs hatch, each tortoise baby, or hatchling, measures about 1.5 inches long and weighs less than a pound. The hatchlings must try to survive without their mother from birth. Many of them don’t survive because their protective shell doesn’t fully develop until they are a few years old. They must find food on their own and often fall prey to one of their many desert predators.
Both the male and female desert tortoise can live up to 80 years old. Of course, a desert tortoise that lives in a zoo is likely to live longer than one in the wild. Living in a zoo means the tortoise doesn’t have to deal with predators and has a regular supply of food. The oldest land tortoise on record is named Jonathan. He is believed to be 185 years old!
As a desert tortoise gets older it can suffer from various illnesses. A loss of habitat and reduced food sources can weaken a tortoise’s immune system causing it to be at risk for upper respiratory illness, shell diseases and herpesvirus.
Desert Tortoise Population
The desert tortoise population has fallen by 90% since 1980 due to habitat loss, livestock grazing, predators and disease. Furthermore, only 1 to 5 of every 100 desert tortoise hatchlings grow to be adults. As a result, their conservation status is classified as Threatened. However, the desert tortoise was given protected status by the Endangered Species Act in 1990.
• Around 150,000 desert tortoises are living in habitat threatened by new construction projects and trash dumping
Desert Tortoise FAQs
What eats a desert tortoise?
Coyotes, foxes, Gila monsters, badgers and road runners are all predators of the desert tortoise. However, these predators are not likely to try to eat an adult desert tortoise. An adult desert tortoise weighs a lot and is difficult to get to when it goes into its shell. Instead, these predators go after the young hatchlings because they are small and easy to capture. This is why so few hatchlings make it to adulthood. Ravens go after hatchlings and even steal the eggs from a desert tortoise’s nest. A mountain lion is one predator that will eat an adult tortoise. A mountain lion has strong jaws and is able to break through an older, more brittle shell of an adult desert tortoise.
Is a desert tortoise a herbivore, carnivore or omnivore?
Desert tortoises are herbivores or plant eaters. They eat the tough, scratchy grasses and plants available to them in the desert heat. Some examples of what they eat include herbs, flowers, various types of grasses and cacti along with the fruit of cacti. It takes a desert tortoise about 20 to 30 days to digest the grasses and other plant life they eat.
Desert tortoises walk through the desert and forage, or search, for plant life to eat. After eating plants and grasses, desert tortoises leave their poop in the desert. This causes more plants to grow from the leftover seeds! So, new plants are created as desert tortoises travel along looking for food.
Can you keep a desert tortoise as a pet? T
A desert tortoise can be kept as a pet, but it’s not recommended. There are some challenges. These tortoises need a certain diet to maintain good health. An owner may not be able to feed their tortoise plants with the proper nutrients. Plus, there is a long list of plants that are poisonous to desert tortoises including Begonias, Boston ivy, Rhododendrons and Snapdragons to name a few. These plants and flowers are common around many households and gardens so there’s always a chance that a pet desert tortoise can get to them.
Another problem with keeping a desert tortoise as a pet is many owners try to release their pet back into the desert. This puts both the pet tortoise and wild desert tortoises at risk. A pet desert tortoise may be carrying an upper respiratory illness that can be given to wild desert tortoises. This illness can be deadly to both captive and wild desert tortoises.
Keeping a desert tortoise as a pet is a long-term commitment. After all, these reptiles can live 60 or more years. So, a family has to make plans for who will continue to care for this pet throughout its life. Not all families are able to make these types of plans.
Releasing a pet tortoise into the desert means an owner is putting an animal into an environment it can’t survive in. Just think, a desert tortoise kept for years as a pet has been given all of the food and water it needs to survive. It doesn’t know how to forage for plants and grasses to eat. A pet desert tortoise released into the desert won’t survive for very long.
So, instead of trying to keep one as a pet, enjoy visiting desert tortoises in zoos and have fun learning more about them in articles and videos online.
How to say Desert Tortoise in ...
1. David Burnie, Dorling Kindersley (2011) Animal, The Definitive Visual Guide To The World's Wildlife
2. Tom Jackson, Lorenz Books (2007) The World Encyclopedia Of Animals
3. David Burnie, Kingfisher (2011) The Kingfisher Animal Encyclopedia
4. Richard Mackay, University of California Press (2009) The Atlas Of Endangered Species
5. David Burnie, Dorling Kindersley (2008) Illustrated Encyclopedia Of Animals
6. Dorling Kindersley (2006) Dorling Kindersley Encyclopedia Of Animals