Radiated Tortoise (Astrochelys radiata) Care

Species Overview

Common Name: Radiated Tortoise
Scientific Name: Astrochelys radiata
Adult Size:12–16 inches (some males can exceed 16 inches), 30–40 lbs
Lifespan:50–100+ years

Radiated tortoises are one of the most striking and highly sought-after tortoise species due to their beautifully patterned shells. Native to southern Madagascar, they are a protected species and may only be legally owned under special permits in many regions. Always confirm that your tortoise is legally obtained and that you have the proper documentation.

Natural Habitat

Radiated tortoises inhabit dry spiny forests and scrublands, where they graze on a variety of grasses, succulents, and broadleaf plants. They thrive in warm, semi-arid environments with consistent access to sun for basking and shelter for shade.

Housing

Outdoor Housing

Outdoor housing is ideal for adult radiated tortoises in warm climates.

• Minimum enclosure size:8×8 feet for an adult; bigger is always better

• Walls: Opaque, at least 16–24 inches high, with 6–12 inches buried to prevent digging out

• Shelter: Provide shaded areas and a predator-proof hide box for security and thermal regulation

• Climate: These tortoises cannot tolerate cold or damp conditions — provide a heated shelter when temperatures fall below 70°F. For more information, click here.

Indoor Housing

For juveniles or in cooler climates, indoor housing is necessary.

• Minimum size:4×2 foot enclosure for juveniles, larger for adults

• Preferred setups: Tortoise tables, large plastic tubs, or custom wooden pens

• Avoid: Glass aquariums (cause stress and do not provide proper ventilation)

Substrate

Use a substrate that holds moisture without molding:

• Coconut coir, cypress mulch, or organic topsoil

• Depth: 3–6 inches to allow some digging

• Avoid sand, gravel, or wood shavings that could be accidentally ingested and cause impaction

Temperature & Heating

• Basking Spot: 90–95°F

• Ambient Warm Side: 80–85°F

• Cool Side: 75–80°F

• Night: 70–75°F minimum

• Heating: Use ceramic heat emitters, radiant heat panels, or basking lamps — avoid heat rocks (burn hazard)

• Monitor temperatures daily with thermometers and regulate with a thermostat

Humidity

• Maintain 50–70% humidity for juveniles to prevent pyramiding

• Provide a humid hide filled with damp sphagnum moss

• Mist the enclosure once or twice daily if needed

• Adults can tolerate slightly lower humidity, but should always have access to fresh water for soaking

Lighting

• Provide 12–14 hours of UVB lighting daily (via high-output fluorescent or mercury vapor bulbs)

• Place UVB bulbs within 12–18 inches of the basking site (no glass/plastic barriers)

• Replace bulbs every 6–12 months as UVB output diminishes over time

• Outdoor tortoises receive UVB naturally from sunlight

Diet

Radiated tortoises are strict herbivores and grazers.

Primary Diet (80–90%)

• Grasses and grass hay (Bermuda, orchard, timothy)

• Edible weeds (dandelion, clover, plantain)
  

Secondary Diet (Occasional)

• Dark leafy greens (collard, mustard, turnip greens, escarole, endive)

• Succulents such as prickly pear cactus pads

• Vegetables such as squash, bell peppers, or carrots (small amounts)

• Very limited fruit (papaya, melon, berries) — use as an occasional treat only

Avoid

• High-protein foods (dog/cat food, meat, legumes in excess)

• Iceberg lettuce (low nutritional value)

• Spinach, chard, and beet greens in large amounts (high oxalate content can interfere with calcium absorption)

Supplementation

• Dust food with calcium carbonate 2–3× weekly

• Provide a reptile multivitamin 1× every 1–2 weeks

• Always pair supplementation with UVB exposure for proper calcium metabolism

Hydration & Soaking

• Provide a shallow water dish large enough for soaking; refresh daily

• Soak tortoises in shallow warm water 2–3 times weekly (especially juveniles)

Behavior & Temperament

Radiated tortoises are generally calm and social compared to other species. They may recognize their caretakers and can become quite interactive. Handle gently and infrequently to reduce stress.

Common Health Concerns

• Pyramiding: Caused by poor diet, lack of humidity, or constant high heat; prevented with proper diet and humidity

• Respiratory infections: Avoid cold, damp conditions

• Nutritional Secondary Hyperparathyroidism (Metabolic Bone Disease): Prevent with calcium, UVB exposure, and balanced nutrition

Key Points

• Radiated tortoises are a long-term commitment and require specialized housing and diet

• They must be kept warm year-round and cannot hibernate

• Proper humidity and a grass-based diet are critical for healthy shell growth

📞 Call us:480-530-0370
🌐 Learn more:www.treeoflifeexotics.vet

We can help you design the perfect setup, choose the right diet, and provide routine wellness exams to keep your radiated tortoise thriving for decades.