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Beaded lizard
Heloderma horridum
 
Size Adults can be more than two feet in length.
Weight 3-6 lbs.
Conservation Status
Diet Beaded lizards are carnivorous. In the wild these lizards hunt small mammals, lizards, birds and will readily eat eggs. Beaded lizards are one of only a few lizards with actual venom. The venom is stored in grooved pits at the base of each tooth. The venom is delivered to the lizards prey by a chewing motion. At the Zoo the beaded lizards are offered rats once weekly, as with most carnivorous reptiles, it will take up to a week or more for the lizard to completely digest it’s meal and be ready to eat again.
Geographic Range Mexico and Guatemala
Where to find me in the Zoo Reptile and Amphibian House
Note: Description below should include Longevity, Behavior, and Reproduction information
The beaded lizard is a large lizard that can be black or brown in color with yellow spots or bands. The tail can be black or brown with a ringed pattern of alternating dark and yellow banding.

Longevity

30+ years


Behavior

The beaded lizard is active during the cooler periods of the day (morning, dusk, late after noon, and at night).

Reproduction

The mating season takes place in September and October. Females lay 2-15 eggs that hatch in 10 -12 months
 
The Zoo has five beaded lizards, three males and two females.

Three beaded lizards (one female and two males) hatched at Birmingham Zoo and arrived at the Philadelphia Zoo on November 17, 2004. The female hatched on March 7, 1998 and the two males hatched on February 13, 1996 and February 26, 1997.

The third male hatched in the wild and has been at the Philadelphia Zoo since February 16, 1978. The second female hatched in the wild in Mexico and has been at the Zoo since June 2, 2002.

The males are on exhibit together. The females are off-exhibit.

Enrichment


Adoption Information


Featured Foster Parent


Fun Facts

  • This lizard is one of only two venomous lizards in the world. The other is the closely related Gila monster. In both species, the venom glands are modified salivary glands.
  • Human bites are very rare.
  • When food is scarce, the lizard metabolizes fat stored in its tail.

Conservation

Introductions

Animal Lingo

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Sources: 1) Philadelphia Zoo staff; 2) Campbell JA, Lamar WW (2004). The Venomous Reptiles of the Western Hemisphere, Vol 1. Ithaca, NY: Cornell University Press. p. 95-106.