Rhino Iguana
The rhino iguana (Cyclura cornuta) gets its name from the “horns” or bony knobs on its snout that resemble a rhinoceros. These large, sturdy lizards typically reach 3–4.5 feet and live 20–30 years (often 40+ in human care). Native to Haiti, the Dominican Republic, and surrounding islands, they inhabit rocky, dry forests and coastal scrub. They are diurnal and spend their days basking and foraging. Rhino iguanas are generally solitary, defending territory in the wild. Their thick bodies, rough scales, and facial horns evolved for protection, combat, and thermoregulation in harsh, sunny habitats.
Fun facts: They have powerful jaws, recognize their keepers, and can become very social with consistent care.
Enclosure
Provide a large, secure outdoor or indoor habitat—minimum 8 ft x 4 ft x 4 ft for adults, larger is strongly preferred. Use a deep, safe substrate such as cypress mulch mixed with soil/sand for digging. Offer large logs, ledges, and rocks for climbing and basking.
Basking temperature should be 115–120°F, warm side 90–95°F, and cool side 75–82°F. Night temps can drop safely to 70–75°F. Provide UVB 10.0/T5 HO for strong bone development. Ideal humidity is 50–70%, with dry basking zones. They tolerate heat very well (up to high 90s) but should not be exposed to temps under 65°F for extended periods.
Diet & Hydration
Rhino iguanas are primarily herbivorous. Feed daily with rotating greens and vegetables; juveniles eat slightly more frequently with higher plant variety.
Weekly Feeding Schedule (Adult):
• Daily: large handful of mixed greens + chopped veggies
• 3–4×/week: safe flowers or fruits as small treats
• 1–2×/week: Mazuri Tortoise Diet or Iguana Diet (optional)
• Portion size: roughly the volume of their head + neck doubled
Staples: collard greens, mustard greens, turnip greens, escarole, endive, dandelion, hibiscus leaves/flowers, squash, green beans, cactus pads.
Treats: berries, mango, papaya, banana (very small amounts), sweet potato.
No Feed/Toxic: avocado, rhubarb, iceberg, dog/cat food, high-oxalate greens in excess (spinach, beet greens).
Hydration comes mostly from produce, plus a large water bowl for soaking and drinking. Light misting helps humidity.
Calcium with D3 2–3× weekly, multivitamin 1× weekly. Males may eat less during breeding season—normal.
Health
Common risks include metabolic bone disease (from lack of UVB or calcium), parasites (internal and external), dehydration, mouth infections, and obesity from too many sugary fruits. Dusting food, providing strong UVB, and maintaining proper temps prevent most issues. Routine fecals recommended.
Handling
Rhino iguanas can be strong, but with consistent interaction they become calm, friendly, and highly handleable. Young or unhabituated adults may be nervous or defensive until they trust the handler. Avoid excessive handling with new iguanas, as stress can cause tail whips or attempts to flee.
Support the chest and hindquarters, maintain calm movements, and never restrain the tail. Many individuals become “dog-tame” and enjoy shoulder perching or sitting calmly with keepers.
Show suitability: Excellent once socialized—large, impressive, very hardy in heat, rarely poop once settled, tolerate multiple shows per day, and can be transported safely. They are usually gentle with kids when well-trained.