Rio Fuerte beaded lizard (Heloderma exasperatum)

Short answers

Rio Fuerte beaded lizard: How big does the enclosure need to be?

150×80×80 cm for one animal (larger is better).

Rio Fuerte beaded lizard: What temperature does it need?

Daytime 26–32 °C, basking spot 35–38 °C (basking spot), at night 18–22 °C.

Rio Fuerte beaded lizard: Does it need UVB lighting?

UVB: UVB recommended (Ferguson zone 1–2, UV index 1–3).

Rio Fuerte beaded lizard: How long do they live?

Life expectancy: approx. 25–30 years.

Rio Fuerte beaded lizard: Is it suitable for beginners?

No – better suited to experienced keepers (difficulty: Expert).

Climate

Daytime temperature

26–32 °C

Night temperature

18–22 °C

Basking spot

35–38 °C (basking spot)

Humidity

50–70 %, higher in the simulated rainy season (with a humid hide)

UVB

UVB recommended (Ferguson zone 1–2, UV index 1–3)

Enclosure

Minimum size

150×80×80 cm for one animal (larger is better)

Substrate

A sand and soil mix they can dig in, with stones, roots and cork tubes; alternating damper and drier zones

Feeding

Food

Carnivorous: rodents, chicks, quail and other bird eggs, occasionally insects

Feeding interval

adults sparingly and irregularly across the year (a strong feeding response → risk of obesity)

Key facts

Adult size

approx. 60–90 cm total length (the northernmost beaded lizard species)

Life expectancy

approx. 25–30 years

Origin

North-western Mexico (southern Sonora, south-western Chihuahua, Sinaloa; the Rio Fuerte and Rio Mayo basins); subtropical dry forest to pine-oak forest, often near water and burrows

Protection status

VENOMOUS. CITES Appendix II / EU Annex B – a commercial-use permit and proof of origin are needed; wild populations are threatened by illegal trade. Keeping venomous animals requires a permit or proof of expertise depending on the German state

Brumation

A cooler, drier rest period matching the dry season (a few weeks at about 15–20 °C); they are more active in the rainy season

Cohabitation

Keeping them singly is the standard. 1.1 only for experienced keepers, in a large enclosure and under supervision. NEVER keep males together (ritual fights)

Notes

Formerly treated as the subspecies Heloderma horridum exasperatum; nocturnal. Markedly more active in the rainy season – lukewarm misting works as enrichment. Highly prone to obesity, so feed deliberately sparingly. Venomous – handle only with experience and protection.

Do you keep this species?

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Related species

• Chiapan beaded lizard (Heloderma alvarezi) – Expert
• Gila monster (Heloderma suspectum) – Expert
• Guatemalan beaded lizard (Heloderma charlesbogerti) – Expert
• Mexican beaded lizard (Heloderma horridum) – Expert
• Aeolian wall lizard (Podarcis raffonei) – Expert
• Anzueto's arboreal alligator lizard (Abronia anzuetoi) – Expert
• Aran rock lizard (Iberolacerta aranica) – Expert
• Aurelio's rock lizard (Iberolacerta aurelioi) – Expert

All species in the care wiki →

What you need to start

To keep Rio Fuerte beaded lizard (Heloderma exasperatum) you typically need: a suitable enclosure (150×80×80 cm for one animal (larger is better)), substrate (A sand and soil mix they can dig in, with stones, roots and cork tubes; alternating damper and drier zones), a heat source with a thermostat, UVB lighting, thermometer and hygrometer, a water dish and hides. You will find equipment in the Reptoria marketplace.