Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Superfamily: Varanoidea
Family: Helodermatidae

Genus/species: Heloderma horridum


GENERAL CHARACTERISTICS: Stout body covered with dark brown and yellow beadlike scales. Powerful limbs, long fat tail. Males usually have broader heads and longer necks than females.

Length to 1 m (3 ft) weighing 5-6 pounds.

Mexican Beaded Lizard IMG_0335

DISTRIBUTION/ HABITAT: Western coast of Sonora, Mexico south to Western Guatemala.
in tropical, deciduous woodland and thorn scrub. Frequently climbs trees. Often diurnal, on very hot days remains in burrows and emerges to hunt at night.


DIET IN THE WILD: H. horridum is a carnivore feeding on young rodents, fledgling birds, eggs, reptiles, arthropods and uses chemosensorily sensors to locate food with its forked tongue.

Academy Diet: Small mice.Mexican Beaded Lizard IMG_1679


LONGEVITY: Thirty years or more.

REPRODUCTION: The female lays her eggs — anywhere from two to 22 — between October and December, and they hatch the following June or July.

REMARKS: Venom is used more for defense than for stunning prey. Venom glands are located in the lower jaw (vs. in upper jaw in venomous snakes). At the base of each tooth is a grooved pit for venom delivery.

The two members of this family, which also includes the Gila Monster (Heloderma suspectum), are two of the three venomous lizards.  Their tenacious, chewing bite is potentially, though rarely fatal to humans.

Mexican Beaded Lizard P1050903

The third venomous lizard is the Komodo Dragon.


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