Gila Monster
Heloderma suspectum
Quick answer
The Gila monster is a large, slow-moving lizard of the southwestern United States and northwestern Mexico, and one of the few venomous lizards in the world. It has striking black-and-orange beaded skin and stores fat in its thick tail to survive long periods without food. Gila monsters spend most of their lives underground, are not aggressive toward people, and can live 20 years or more.
Gila Monster facts at a glance
| Scientific name | Heloderma suspectum |
|---|---|
| Diet | Carnivore |
| Habitat | Deserts and scrubland |
| Lifespan | 20+ years |
| Length | Up to 0.6 m (2 ft) |
| Venom | Venomous bite, rarely dangerous to humans |
| Conservation status | Near Threatened (IUCN) |
| Kingdom | Animalia |
|---|---|
| Phylum | Chordata |
| Class | Reptilia |
| Order | Squamata |
| Family | Helodermatidae |
| Genus | Heloderma |
Where it lives
Deserts and scrubland of the southwestern United States and northwestern Mexico.
Behavior and life underground
Gila monsters are secretive and spend an estimated 90 percent of their lives in burrows and shelters, emerging mainly in the cooler hours of spring and early summer. They move slowly and rely on warning coloration rather than speed to deter predators. Their fat-storing tail lets them survive for months between meals.
Diet and feeding
These lizards are carnivores that raid nests for eggs and also eat young birds, small mammals, and reptiles. Because meals are infrequent, they gorge when food is available and store the energy as fat. A good sense of smell, aided by the flicking tongue, helps them locate buried eggs and nests.
Venom and the bite
The Gila monster delivers venom through grooved teeth in the lower jaw, chewing to work the venom into a wound rather than injecting it like a snake. The venom is rarely life-threatening to a healthy adult human but causes intense pain and swelling. Compounds in the venom have inspired medicines, including a drug used to treat type 2 diabetes.
Habitat and conservation
Gila monsters live in the deserts and scrublands of the southwestern United States and northwestern Mexico, favoring rocky foothills with access to shelter. They are listed as Near Threatened and are protected by law in much of their range. Habitat loss and illegal collection for the pet trade are their main threats.
Frequently asked questions about the Gila Monster
Are Gila monsters venomous?
Yes. The Gila monster is one of the few venomous lizards. It delivers venom through grooved teeth while chewing, causing severe pain and swelling, though bites are rarely fatal to humans.
Are Gila monsters dangerous to humans?
They are not aggressive and bites are uncommon, usually happening only when the lizard is handled or harassed. A bite is very painful but seldom life-threatening to a healthy adult.
What do Gila monsters eat?
Gila monsters are carnivores that eat eggs, nestling birds, small mammals, and reptiles. They gorge when food is plentiful and store fat in their tails for lean times.
How long do Gila monsters live?
Gila monsters can live 20 years or more, and individuals in captivity sometimes live even longer with consistent care and food.
Where do Gila monsters live?
They live in the deserts and scrublands of the southwestern United States and northwestern Mexico, spending most of their time in burrows and rocky shelters.
Are Gila monsters endangered?
They are listed as Near Threatened and are legally protected across much of their range. Habitat loss and illegal collection for the pet trade are the main pressures on them.
