---
title: "What the sources say about the Gila Monster | AnimalTracks.wiki"
description: "51 claims from the Gila Monster profile, each beside the words of the source that backs it."
image: "https://animaltracks.wiki/images/animals/gila-monster-1.webp"
canonical: "https://animaltracks.wiki/animals/gila-monster/sources/"
---

# What the sources say about the Gila Monster (*Heloderma suspectum*)

> 51 claims from the Gila Monster profile, each beside the words of the source that backs it. A "..." marks a cut in a quote and [brackets] an insertion.

Profile: [Gila Monster](https://animaltracks.wiki/animals/gila-monster/)

## Gila monster. Smithsonian's National Zoo and Conservation Biology Institute.

https://nationalzoo.si.edu/animals/gila-monster

| The page says | The source says |
| :--- | :--- |
| the largest lizard native to the United States, reaching up to about 22 inches (56 centimeters) long | The largest lizards native to the United States, Gila monsters can measure up to about 22 inches (56 centimeters) in total length. (note: The Smithsonian page is undated; nps-gila-monster (Last updated: August 19, 2026) agrees: 'largest lizard in the United States. It grows to 22 inches (560 millimeters) long'.) |
| It lives mainly in Arizona and Mexico, and its range reaches into the edges of California, Nevada, Utah and New Mexico | The Gila monster lives primarily in Arizona and Mexico, the extreme southeastern corner of California, the southern tip of Nevada, and the southwestern corners of Utah and New Mexico. (note: 'mainly' is the source's 'primarily'; 'edges' covers its corner, tip and corners.) |
| It is black, with pink or orange markings along its back | Gila monsters are black, patterned along their backs with contrasting pink or orange. |
| In the northern subspecies those markings usually form unbroken bands. In the southern subspecies they break up into a net-like pattern | In the southern subspecies, the reticulated Gila monster, the light markings are broken up to form a reticulated pattern. In the northern subspecies, the banded Gila monster, the light markings generally form an unbroken band across the back. (note: 'usually' is the source's 'generally'; 'net-like' glosses 'reticulated'.) |
| Venomous snakes inject venom through hollow fangs. A Gila monster chews it in | Rather than injecting venom through hollow fangs like venomous snakes, Gilas have enlarged, grooved teeth in their lower jaw. When they bite, their powerful jaws chew the venom in |
| A Gila monster can bite quickly and hold on stubbornly | It can bite quickly and hold on tenaciously. |
| sometimes keeping hold of a predator for more than ten minutes | Gila monsters may hold onto a predator for more than ten minutes. (note: 'sometimes' carries the source's 'may'.) |
| A Gila monster's top speed is only 1.5 miles per hour (2.4 km/h) | Their top speed is only 1.5 miles per hour (2.4 kilometers per hour). |
| It can eat up to a third of its own body weight in one meal | They can eat up to one-third of their body weight in one meal. |
| store fat in its tail and body | They store fat both in their tails and their bodies. |
| That, plus a slow metabolism, means it doesn't need to search for food often, so it spends most of its life hidden underground | Their low metabolic rates and ability to eat large meals combined with their capacity to store fat, make frequent searching for food unnecessary. Therefore, Gila monsters often stay hidden underground. ... Gila monsters spend most of their lives hidden below the ground. (note: Settled: 'means' is the source's 'make ... unnecessary' and 'so' is its 'Therefore'; both links are the source's own.) |
| It may get all the calories it needs for a year from three or four large meals | It has been suggested that Gilas can consume all the calories they need for a year in three or four large meals. (note: 'may' carries the source's 'It has been suggested'.) |
| It doesn't need fangs. A Gila monster has enlarged, grooved teeth in its lower jaw, and when it bites, its powerful jaws chew the venom in through capillary action along the grooves | Rather than injecting venom through hollow fangs like venomous snakes, Gilas have enlarged, grooved teeth in their lower jaw. When they bite, their powerful jaws chew the venom in through capillary action along the grooves in these teeth. |
| Gila monsters may hold onto a predator for more than ten minutes | Gila monsters may hold onto a predator for more than ten minutes. |
| for a lizard that tops out at 1.5 mph | Their top speed is only 1.5 miles per hour (2.4 kilometers per hour). (note: vibe.reason; replaces 'slow calculating venom', which had no source and sat against the Smithsonian's 'It can bite quickly' (#184)) |
| chewing its venom in along grooved teeth | When they bite, their powerful jaws chew the venom in through capillary action along the grooves in these teeth. (note: vibe.reason) |

## Gila Monster. San Diego Zoo Wildlife Alliance.

https://animals.sandiegozoo.org/animals/gila-monster

| The page says | The source says |
| :--- | :--- |
| weighing as much as 3 pounds (1.4 kilograms) | Weight: 1.5 to 3 pounds (.7 to 1.4 kilograms) (note: battleStats.weightKg: 1 rests on this range: 0.7 to 1.4 kg is Light throughout, where the name guess made it Medium (#184).) |
| It can live up to 20 years in the wild and more than 30 in expert care | Up to 20 years in its native range; over 30 years in expert care |
| Bead-like scales called osteoderms cover its whole body except the belly | Gila monsters are heavy-bodied lizards covered with beadlike scales, called osteoderms, that are black and yellow or pink covering all but their belly. |
| For a person, a bite is painful but rarely deadly | A Gila monster bite is painful to humans, but it is rarely lethal. (note: stats.dangerLevel: Extreme rests on this and the shock claim: serious harm, but no source reports a death, so Extreme ("Severe injury likely on contact"), not Deadly (#184).) |
| so it has to sneak up on prey and bite before it gets away | These lizards are not very fast, so they need to sneak up on prey and bite them before they get away. |
| A drug for type 2 diabetes is based on a protein from Gila monster saliva. People sometimes call the drug lizard spit | A drug for the management of Type 2 diabetes is based on a protein from the Gila monster’s saliva. The drug is sometimes referred to as lizard spit. |
| Gila monsters became the first venomous wildlife in North America to get legal protection, back in 1952 | In 1952, Gila monsters became the first venomous wildlife in North America to be given legal protection. |
| It is painful, but rarely deadly | A Gila monster bite is painful to humans, but it is rarely lethal. |
| Bites are not common, because Gila monsters tend to avoid people and other large animals | The biggest problem you might have if a Gila monster bit you is trying to get the lizard to release its grip! This isn't a common occurrence, as Gila monsters tend to avoid humans and other large wildlife. (note: Settled: 'because' is the source's 'as'. The quote's 'might' sits in the lead-in sentence that gives 'This' its meaning (being bitten), not in the claim.) |
| To warn off a would-be predator, a Gila monster opens its mouth very wide and hisses | To warn off potential predators, they open their mouth very wide and hiss. (note: 'would-be' carries the source's 'potential'.) |
| Most of its prey is small enough to be overpowered by the strength of its bite, so its venom may be more useful for defense than for hunting | The monster's venomous saliva may be more useful as a defense against predators rather than for hunting, because most of the lizard's prey is small enough to be subdued by the strength of the bite. (note: Settled: 'so' restates the source's 'because' in the other direction; same cause, and 'may' is kept.) |

## Gila Monster. Saguaro National Park, National Park Service.

https://www.nps.gov/sagu/learn/nature/gila-monster.htm

| The page says | The source says |
| :--- | :--- |
| The beads get their texture from tiny nodules of bone inside the skin, and the pattern is different on every Gila monster | Their distinct beaded pattern is unique to each individual and reflects the texture of tiny, individual nodules of bone found within their skin. |
| Glands in its lower jaw make the venom, which mixes with saliva and is pulled into the wound along grooved teeth by capillary action | Gila Monsters produce venom in glands in their lower jaws. This is mixed with saliva and pulled into the wound along grooved teeth by capillary action. |
| the venom can cause shock, a rapid drop in blood pressure | The venom can cause shock (rapid drop in blood pressure) |
| The longer it hangs on and chews, the more venom gets into the wound | Thus, the longer the lizard hangs on, or "chews," the greater the amount of venom introduced. |
| It raids nests for eggs and nestling birds, and eats newborn or young rabbits, young packrats and other rodents still in the nest, along with lizards and, occasionally, small snakes | They eat newborn or young rabbits, young packrats, and other rodents still on the nest, as well as eggs, nestling birds, lizards, and occasionally small snakes. |
| sheltered from hot, dry desert conditions | they spend the majority of their time underground and out of sight, an adaptation for hot, dry desert conditions |
| Today every US state where they live protects them by law, and so does Mexico | Gila Monsters are protected by state law in each of the states where they occur: Arizona, California, Nevada, Utah, New Mexico, and Mexico. (note: Current-state claim: the NPS page is dated 'Last updated: August 19, 2026'. 'so does' is a list, not a cause.) |
| People are their main threat, through habitat loss to development, illegal poaching and roadkill | People represent the Gila Monster's primary threat through habitat loss by development, illegal poaching, and roadkill. |
| Mainly desert scrub, desert grassland, rocky lowlands and rocky canyons, from southern Nevada and Utah south to northern Sinaloa, Mexico | The Gila Monster occurs from Nevada to the north to northern Sinaloa, Mexico to the south ... Its habitat is mainly rocky lowlands and desert scrub, desert grassland, and rocky canyons (note: 'southern Nevada and Utah' follows si-gila-monster's range: 'the southern tip of Nevada, and the southwestern corners of Utah and New Mexico'.) |
| Eggs, nestling birds, young rabbits, packrats and other rodents still in the nest, and lizards | They eat newborn or young rabbits, young packrats, and other rodents still on the nest, as well as eggs, nestling birds, lizards |
| Bead-armored venomous lizard, grooved chewing teeth, and Sonoran Desert survivor | one of the best known and most often asked about, but it is one of the rarest to encounter of all the Sonoran Desert reptiles (note: "Bead-armored" and "grooved chewing teeth" are covered by the osteoderm and venom-delivery claims above. The quote's 'often' is about how often visitors ask, not about the lizard, so no hedge belongs on the tagline.) |
| bites by hanging on | Thus, the longer the lizard hangs on, or "chews," the greater the amount of venom introduced. (note: vibe.reason) |

## Furman (2012). The development of Byetta (exenatide) from the venom of the Gila monster as an anti-diabetic agent. Toxicon.

https://doi.org/10.1016/j.toxicon.2010.12.016

| The page says | The source says |
| :--- | :--- |
| The venom contains exendin-4, a peptide (a short chain of amino acids) that mimics a gut hormone called GLP-1 | hormones from the gut contributed to the insulin secretion in response to meals, led to the identification of glucagon-like peptide 1 (GLP-1) as an important 'incretin' hormone ... venom from the Gila monster, Heloderma suspectum, led to the isolation of a 39-amino acid peptide, designated exendin-4 ... Exendin-4 mimicked GLP-1 through stimulating the GLP-1 receptor. |
| which increases insulin secretion | GLP-1 not only increases insulin secretion but increases β-cell proliferation and survival |
| GLP-1 breaks down fast in the body | GLP-1 has a very short half due to its rapid breakdown by dipeptidyl peptidase IV and ectopeptidases. |
| exendin-4 is far more stable | The much greater stability of exendin-4 led to its experimental and clinical evaluation as an anti-diabetic agent |
| scientists built a synthetic copy and sold it as the diabetes drug Byetta starting in 2005 | its introduction to the market in 2005 (note: the paper's title names the drug: "The development of Byetta (synthetic exendin-4; exenatide)") |
| Beaded osteoderm armor and venom containing exendin-4, the peptide behind the diabetes drug exenatide (Byetta) | isolation of a 39-amino acid peptide, designated exendin-4 ... its introduction to the market in 2005 (note: the osteoderm half rests on sdzwa's 'beadlike scales, called osteoderms' and nps's 'tiny, individual nodules of bone found within their skin'.) |
| Its venom contains a 39-amino-acid peptide (a short chain of amino acids) called exendin-4, which mimics a gut hormone called GLP-1 | hormones from the gut contributed to the insulin secretion in response to meals, led to the identification of glucagon-like peptide 1 (GLP-1) as an important 'incretin' hormone ... isolation of a 39-amino acid peptide, designated exendin-4 ... Exendin-4 mimicked GLP-1 through stimulating the GLP-1 receptor |
| that increases insulin secretion | GLP-1 not only increases insulin secretion but increases β-cell proliferation and survival |
| GLP-1 breaks down fast in the body, but exendin-4 is far more stable | GLP-1 has a very short half due to its rapid breakdown ... The much greater stability of exendin-4 |
| scientists built a synthetic copy of it, exenatide, and put it on the market as the diabetes drug Byetta in 2005 | its introduction to the market in 2005 (note: the paper's title names the drug: "The development of Byetta (synthetic exendin-4; exenatide)") |

## Hammerson, Frost & Gadsden (2007). Heloderma suspectum. The IUCN Red List of Threatened Species 2007: e.T9865A13022716.

https://doi.org/10.2305/iucn.uk.2007.rlts.t9865a13022716.en

| The page says | The source says |
| :--- | :--- |
| The IUCN last assessed the species in 2007, as Near Threatened | IUCN Red List category: Near Threatened (NT). (note: GBIF's copy of the current Red List returns this 2007 assessment (DOI year 2007), so it is the latest.) |
| Near Threatened | IUCN Red List category: Near Threatened (NT). |