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What the sources say

Gila MonsterHeloderma suspectum

Every figure, record and mechanism on the Gila Monster profile was written from a source, and this is the working table behind it: 51 claims checked word for word against these sources. The left column is what the page says. The right column is the source's own words, copied, not paraphrased; a ... marks a cut and[brackets] an insertion. Open any source and check it yourself.

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Source
01

Smithsonian's National Zoo and Conservation Biology Institute

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

The page saysthe largest lizard native to the United States, reaching up to about 22 inches (56 centimeters) long
The source saysThe 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'.
The page saysIt lives mainly in Arizona and Mexico, and its range reaches into the edges of California, Nevada, Utah and New Mexico
The source saysThe 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.
The page saysIt is black, with pink or orange markings along its back
The source saysGila monsters are black, patterned along their backs with contrasting pink or orange.
The page saysIn the northern subspecies those markings usually form unbroken bands. In the southern subspecies they break up into a net-like pattern
The source saysIn 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'.
The page saysVenomous snakes inject venom through hollow fangs. A Gila monster chews it in
The source saysRather 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
The page saysA Gila monster can bite quickly and hold on stubbornly
The source saysIt can bite quickly and hold on tenaciously.
The page sayssometimes keeping hold of a predator for more than ten minutes
The source saysGila monsters may hold onto a predator for more than ten minutes.Note: 'sometimes' carries the source's 'may'.
The page saysA Gila monster's top speed is only 1.5 miles per hour (2.4 km/h)
The source saysTheir top speed is only 1.5 miles per hour (2.4 kilometers per hour).
The page saysIt can eat up to a third of its own body weight in one meal
The source saysThey can eat up to one-third of their body weight in one meal.
The page saysstore fat in its tail and body
The source saysThey store fat both in their tails and their bodies.
The page saysThat, plus a slow metabolism, means it doesn't need to search for food often, so it spends most of its life hidden underground
The source saysTheir 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.
The page saysIt may get all the calories it needs for a year from three or four large meals
The source saysIt 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'.
The page saysIt 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
The source saysRather 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.
The page saysGila monsters may hold onto a predator for more than ten minutes
The source saysGila monsters may hold onto a predator for more than ten minutes.
The page saysfor a lizard that tops out at 1.5 mph
The source saysTheir 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)
The page sayschewing its venom in along grooved teeth
The source saysWhen they bite, their powerful jaws chew the venom in through capillary action along the grooves in these teeth.Note: vibe.reason

Source
02

San Diego Zoo Wildlife Alliance

Gila Monster. San Diego Zoo Wildlife Alliance.

The page saysweighing as much as 3 pounds (1.4 kilograms)
The source saysWeight: 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).
The page saysIt can live up to 20 years in the wild and more than 30 in expert care
The source saysUp to 20 years in its native range; over 30 years in expert care
The page saysBead-like scales called osteoderms cover its whole body except the belly
The source saysGila monsters are heavy-bodied lizards covered with beadlike scales, called osteoderms, that are black and yellow or pink covering all but their belly.
The page saysFor a person, a bite is painful but rarely deadly
The source saysA 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).
The page saysso it has to sneak up on prey and bite before it gets away
The source saysThese lizards are not very fast, so they need to sneak up on prey and bite them before they get away.
The page saysA drug for type 2 diabetes is based on a protein from Gila monster saliva. People sometimes call the drug lizard spit
The source saysA 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.
The page saysGila monsters became the first venomous wildlife in North America to get legal protection, back in 1952
The source saysIn 1952, Gila monsters became the first venomous wildlife in North America to be given legal protection.
The page saysIt is painful, but rarely deadly
The source saysA Gila monster bite is painful to humans, but it is rarely lethal.
The page saysBites are not common, because Gila monsters tend to avoid people and other large animals
The source saysThe 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.
The page saysTo warn off a would-be predator, a Gila monster opens its mouth very wide and hisses
The source saysTo warn off potential predators, they open their mouth very wide and hiss.Note: 'would-be' carries the source's 'potential'.
The page saysMost 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 source saysThe 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.

Source
03

Saguaro National Park, National Park Service

Gila Monster. Saguaro National Park, National Park Service.

The page saysThe beads get their texture from tiny nodules of bone inside the skin, and the pattern is different on every Gila monster
The source saysTheir distinct beaded pattern is unique to each individual and reflects the texture of tiny, individual nodules of bone found within their skin.
The page saysGlands in its lower jaw make the venom, which mixes with saliva and is pulled into the wound along grooved teeth by capillary action
The source saysGila 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 page saysthe venom can cause shock, a rapid drop in blood pressure
The source saysThe venom can cause shock (rapid drop in blood pressure)
The page saysThe longer it hangs on and chews, the more venom gets into the wound
The source saysThus, the longer the lizard hangs on, or "chews," the greater the amount of venom introduced.
The page saysIt 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
The source saysThey 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.
The page sayssheltered from hot, dry desert conditions
The source saysthey spend the majority of their time underground and out of sight, an adaptation for hot, dry desert conditions
The page saysToday every US state where they live protects them by law, and so does Mexico
The source saysGila 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.
The page saysPeople are their main threat, through habitat loss to development, illegal poaching and roadkill
The source saysPeople represent the Gila Monster's primary threat through habitat loss by development, illegal poaching, and roadkill.
The page saysMainly desert scrub, desert grassland, rocky lowlands and rocky canyons, from southern Nevada and Utah south to northern Sinaloa, Mexico
The source saysThe 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 canyonsNote: 'southern Nevada and Utah' follows si-gila-monster's range: 'the southern tip of Nevada, and the southwestern corners of Utah and New Mexico'.
The page saysEggs, nestling birds, young rabbits, packrats and other rodents still in the nest, and lizards
The source saysThey eat newborn or young rabbits, young packrats, and other rodents still on the nest, as well as eggs, nestling birds, lizards
The page saysBead-armored venomous lizard, grooved chewing teeth, and Sonoran Desert survivor
The source saysone of the best known and most often asked about, but it is one of the rarest to encounter of all the Sonoran Desert reptilesNote: "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.
The page saysbites by hanging on
The source saysThus, the longer the lizard hangs on, or "chews," the greater the amount of venom introduced.Note: vibe.reason

Source
04

Furman 2012

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

The page saysThe venom contains exendin-4, a peptide (a short chain of amino acids) that mimics a gut hormone called GLP-1
The source sayshormones 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.
The page sayswhich increases insulin secretion
The source saysGLP-1 not only increases insulin secretion but increases β-cell proliferation and survival
The page saysGLP-1 breaks down fast in the body
The source saysGLP-1 has a very short half due to its rapid breakdown by dipeptidyl peptidase IV and ectopeptidases.
The page saysexendin-4 is far more stable
The source saysThe much greater stability of exendin-4 led to its experimental and clinical evaluation as an anti-diabetic agent
The page saysscientists built a synthetic copy and sold it as the diabetes drug Byetta starting in 2005
The source saysits introduction to the market in 2005Note: the paper's title names the drug: "The development of Byetta (synthetic exendin-4; exenatide)"
The page saysBeaded osteoderm armor and venom containing exendin-4, the peptide behind the diabetes drug exenatide (Byetta)
The source saysisolation of a 39-amino acid peptide, designated exendin-4 ... its introduction to the market in 2005Note: the osteoderm half rests on sdzwa's 'beadlike scales, called osteoderms' and nps's 'tiny, individual nodules of bone found within their skin'.
The page saysIts venom contains a 39-amino-acid peptide (a short chain of amino acids) called exendin-4, which mimics a gut hormone called GLP-1
The source sayshormones 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
The page saysthat increases insulin secretion
The source saysGLP-1 not only increases insulin secretion but increases β-cell proliferation and survival
The page saysGLP-1 breaks down fast in the body, but exendin-4 is far more stable
The source saysGLP-1 has a very short half due to its rapid breakdown ... The much greater stability of exendin-4
The page saysscientists built a synthetic copy of it, exenatide, and put it on the market as the diabetes drug Byetta in 2005
The source saysits introduction to the market in 2005Note: the paper's title names the drug: "The development of Byetta (synthetic exendin-4; exenatide)"

Source
05

Hammerson, Frost & Gadsden 2007

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

The page saysThe IUCN last assessed the species in 2007, as Near Threatened
The source saysIUCN 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.
The page saysNear Threatened
The source saysIUCN Red List category: Near Threatened (NT).

How the table was made: a writer drafted the profile from these sources and logged each claim with its quote, a reviewer with nothing but this table checked every sentence said no more than its quote, and a script confirmed each quote appears word for word in the source. The method is in the site'sAbout page.