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3/28/21

Gila Monster

The Gila (hee-luh) monster is the largest lizard native to the United States at two feet long and 5 pounds. They are found in the Mojave, Sonoran, and Chihuahuan deserts in southwestern U.S and northwestern Mexico. There are two subspecies, the northern and the southern, with slightly different patterned backs.

They are one of the few venomous lizards in the world, and their pattern of black and pink, orange or yellow warns predators of this toxin. This toxin, a neurotoxin, is fairly strong, but they do not release much of it, so although extremely painful, their bites do not induce human death. Gila monsters, unlike snakes, do not inject their venom, instead they bite and chew their victim to allow the toxin to enter the wound. Gila monsters generally hold on tight once they have bitten down to release as much venom into the bite; some have held on for nearly 10 minutes. As all the Gila monster’s prey is pretty defenseless, their venom is most likely to be a defense.

Gila monsters move very slowly and spend most of their time, between 95%-98% of their lives, underground. They come out from their burrows in the spring and fall to feed and mate, but not often: gila monsters store fat in their tails and can go months without eating. They might only eat 3-4 big meals per year. They mostly eat eggs, newborn mammals (such as young rabbits), carrion, and other small prey. They move slowly and will hiss and gape to try and scare predators before they bite, so if left alone they are relatively harmless. However, in the spring male-to-male combat occurs as a result of the mating season. Females lay 2-12 eggs, which will weather the winter below ground and hatch the next spring. They do not take care of their hatchlings, which are basically miniature 6 inch replicas of their parents. These hatchlings may have quite a long life, and in captivity they have been known to live from 20 years to up to 36.

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Image courtesy of the Smithsonian National Zoo and Conservation Biology Institute

Gila monsters are mostly threatened by habitat destruction and humans coming into their territory. This includes overgrazing, truck farming, and cotton farming. They are considered a threatened species.

The desert is home to many amazing animals who could be endangered by their habitat being fragmented and destroyed, or by climate change messing up the delicate balance of the desert. By protecting gila monsters we also protect the other animals in their habitat.

They are protected under Arizona law. Ways to protect them may include implementing sustainable farming methods, creating protected areas where wild gila monsters may live, and teaching people about these amazing venomous lizards. We should also make sure that people know how to safely interact with the gila monsters, as fear is often a powerful motivator for hunting animals.

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Image Courtesy of Joel Sartore

Image courtesy of the Smithsonian National Zoo and Conservation Biology Institute

Image courtesy of the National Park Service

Image courtesy of Ariel Kahrl

Works Cited

Sartore, J. (2018, September 24). Gila Monster. Retrieved October 24, 2020, from https://www.nationalgeographic.com/animals/reptiles/g/gila-monster/

Gila monster. (2018, June 29). Retrieved October 24, 2020, from https://nationalzoo.si.edu/animals/gila-monster

Gila Monster. (n.d.). Retrieved October 24, 2020, from https://www.nps.gov/sagu/learn/nature/gila-monster.htm

Cover Image Courtesy of the National Park Service