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  3. Mexican Beaded Lizard

Reptiles · Squamata · Helodermatidae

Mexican Beaded Lizard

Heloderma horridum

Least Concern

The species is abundant and widely distributed; it faces no significant short-term risk.

Spotted something wrong?

The Mexican beaded lizard is, along with the Gila monster, one of the few venomous lizards in the world. It is black with yellow blotches and its skin is covered in osteoderms that give it a beaded look. It is slow and nocturnal, and its venom, which it delivers by chewing rather than biting, has proved of enormous medical interest.

Weight

700 g – 4 kg

Size

57 cm – 90 cm

Life expectancy

30 years

Diet

Carnivore

Feeds mainly on other animals.

Activity

Nocturnal

Active mainly at night.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

RainforestTemperate forestDesert
2countries14parks1same family

Fun facts

  • It does not inject its venom: it produces it in glands in the lower jaw and lets it run along grooves in the teeth while chewing, so the longer it holds on, the more venom it delivers.
  • The venom of its relative the Gila monster gave rise to the GLP-1 analogue drugs, the basis of current treatments for type 2 diabetes and obesity, one of the most profitable cases of bioprospecting in history.
  • Its skin is covered in osteoderms, small bony plates within the scales, which give it a characteristic beaded appearance and considerable protection.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (reptile)
Habitat and environment
Dry forest, thorn scrub and ravines of the Pacific slope of Mexico and Guatemala
Sexual maturity
6 years
Gestation / incubation
180 days of incubation
Litter / clutch size
6 eggs

Sources consulted: Wikipedia (es): Heloderma horridum

Where to find it

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The pins mark the parks where its presence is documented.

Where to see it

Parks and dive sites where this species has been documented — showing 10 of 14.

Related species

Other species in the catalogue with the most in common with Mexican Beaded Lizard — same habitat, park, country, tags or family.

Same taxonomic family
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Keep exploring

Based on what we already know about mexican beaded lizard.

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See its range on the interactive map→
Sian Ka'anMexico
El VizcainoMexico
CalakmulMexico
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El Pinacate and Gran Desierto de AltarMexico
Sumidero CanyonMexico
Sierra GordaMexico
Constitución de 1857Mexico
Cumbres de MonterreyMexico
Cacahuamilpa CavernsMexico
See all 14 parks
Gila MonsterNear Threatened

Gila Monster

Heloderma suspectum

Least Concern

Mexican Mouse Opossum

Marmosa mexicana

PumaLeast Concern

Puma

Puma concolor

OcelotLeast Concern

Ocelot

Leopardus pardalis

Turkey VultureLeast Concern

Turkey Vulture

Cathartes aura

Least Concern

Great Horned Owl

Bubo virginianus

CountriesMexico
ParksSian Ka'anMexico
TagsCarnivore
Carnivore
Nocturnal
Solitary
Reptile
Rainforest
Temperate forest
Desert
Mexico
Guatemala