Radiated tortoise — Care Sheet & Morphs

Husbandry requirements

Radiated tortoise — origin: Endemic to southern and south-western Madagascar (arid spiny forest and dry scrubland)..

Terrarium temperature gradient

Night min18 °C

Cool side22–26 °C

Warm side28–32 °C

Basking spot35–40 °C

A sun-loving species of arid habitats: a genuine hot basking spot is essential, with a thermal gradient down to a cool side. A natural night-time drop is welcome; do not let it stay cold for long. Absolutely avoid cold damp and draughts.

Enclosure (adult)

300 × 150 × 60 cm

Secure outdoor enclosure (strongly recommended) in a suitable climate, or a large heated indoor pen/greenhouse. Loose substrate for digging, hides and shaded areas.

Minimum dimensions for ONE adult indoors; bigger is always better, and outdoor access to graze in the sun is ideal. Allow much more space for several individuals. IMPORTANT: PROTECTED species — classified as Critically Endangered (CR) by the IUCN, listed in CITES Appendix I and EU Annex A. Keeping, transfer and transport are strictly regulated: CITES documents/intra-EU certificates and a national declaration/permit are mandatory. Acquire only captive-bred, legally documented animals; refuse any wild-caught origin.

Humidity

40–60 %

A generally dry ambient for adults, but not desert-like. Juveniles need more humid microclimates (a damp hide, regular baths) to prevent shell pyramiding.

Substrate

Soil/sand mixCypress mulchHay and grass (outdoors)

A substrate deep enough for the animal to dig and settle in, with a rather dry surface but a slightly damp lower layer beneath the hide. Avoid dusty substrates and permanently waterlogged ground.

UVB

Optional

Essential: strong UVB of the type used for tortoises (upper Ferguson zone), the lamp replaced according to the manufacturer's recommendations. Ideally, exposure to direct, unfiltered sunlight whenever the climate allows.

Water source

Always available

Provide at all times a clean, wide, shallow water dish for drinking and soaking. Bathe juveniles regularly (lukewarm water, a few minutes) for hydration and gut transit.

Origin

Testudinidae

Endemic to southern and south-western Madagascar (arid spiny forest and dry scrubland).

Feeding & health

Diet

Strict herbivore (grazer) — None; do not feed animal protein.

A high-fibre, low-protein diet: grasses, hay, wild plants (dandelion, plantain, mallow), Opuntia pads and succulents, varied leafy greens. Strictly limit fruit and sugary vegetables. Supplement with calcium (cuttlebone); UVB is essential for vitamin D synthesis. Excess protein/rapid growth = pyramiding and kidney damage.

Breeding

Oviparous

Clutch 3–12 eggs/young. Usually a few eggs per clutch (occasionally more), with several clutches possible per season. Long and variable incubation, lasting several months at moderate warmth. The breeding and transfer of offspring of a CITES Appendix I / EU Annex A species are regulated: marking, declaration and certificates are mandatory.

Health watch points

Shell pyramiding (insufficient humidity in the young, excess protein, growth too fast)
Metabolic bone disease / calcium deficiency and UVB–vitamin D deficit
Respiratory infections linked to cold and damp
Internal parasites (nematodes), especially in poorly monitored animals or those of dubious origin
Egg retention (dystocia) in females

Morphs & genetics

Registry of 2 documented genes for Radiated tortoise.

Snow / White (Anomaly) white radiataRec
Pattern DensityDom

Pairing calculator

Pick each parent's genotype — clutch probabilities update live. Free, no sign-up.

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Radiated tortoise × Radiated tortoise

Probabilities per gene (independent loci).

Expected clutchSelect at least one gene on a parent.

Frequently asked questions

Answers to the most common questions about keeping the radiated tortoise.

How long does a radiated tortoise live?▾

It's an extremely long-lived species: 60 to over 100 years in well-cared-for captivity, the record being held by 'Tu'i Malila', reputed to have lived to about 188. Acquiring one therefore commits you to care that often outlasts a single human lifetime and must be planned across several generations.

How much space is needed to house an adult?▾

Allow at least 300 x 150 cm indoors for a SINGLE adult, larger always being better, ideally with outdoor access to graze in the sun. A secure outdoor enclosure is strongly recommended in a suitable climate; otherwise, a large indoor pen or heated greenhouse.

Is UVB really essential for this tortoise?▾

Yes, absolutely. The radiated tortoise needs strong tortoise-grade UVB (Ferguson zone 3-4, roughly 10-12%) to synthesize vitamin D3 and mineralize its shell. Direct, unfiltered sunlight is ideal whenever the climate allows; without UVB, it develops deficiencies and metabolic bone disease.

What should a radiated tortoise eat?▾

It's a strict grazing herbivore: its diet should be high in fibre and low in protein, based on grasses, hay, wild plants (dandelion, plantain, mallow), Opuntia pads and succulents. Sugary fruit and vegetables should be strongly limited, animal protein must never be given, and calcium should be supplemented with cuttlebone.

What temperatures and hot spot should be provided?▾

This sun-loving species from arid habitats needs a genuine basking hot spot of 35-40°C, with a gradient down to a cool side of 22-26°C and a warm side of 28-32°C. A natural night-time drop is welcome as long as it doesn't stay below 15-18°C for long; absolutely avoid cold dampness and draughts.

Why does the shell of some individuals become pyramided?▾

Shell pyramiding mainly affects young tortoises raised too dry, fed excess protein, and growing too fast. It's prevented by giving juveniles more humid microclimates (a damp hide, regular baths) and following a low-protein diet. Adults should be kept in a dry environment, between 40 and 60% humidity, without being desert-like.

Is keeping a radiated tortoise regulated?▾

Yes, very strictly. The species is classified as Critically Endangered (CR) by the IUCN, listed in CITES Appendix I and EU Annex A: keeping, transfer and transport require CITES documents or intra-EU certificates and a national declaration or permit. Only acquire captive-born, legally documented animals, and refuse any wild-caught origin.

Should water and baths be provided?▾

Yes: always provide a wide, shallow dish of clean water so it can drink and soak. Juveniles benefit from regular lukewarm baths of a few minutes for hydration and healthy gut transit.

Can several radiated tortoises be housed together?▾

The species is calm and generally tolerant of conspecifics, but each adult requires a very large space. Overcrowding creates stress and competition, so much more floor area must be provided for several individuals.

How does it reproduce?▾

It's oviparous and usually lays 3 to 6 eggs per clutch (up to about 12), with several clutches possible per season. Incubation is long and variable, roughly 5 to 8 months at 28-30°C. As a CITES Appendix I species, breeding and transferring offspring are regulated (marking, declaration and certificates are mandatory).

What are the main health problems?▾

The most common are shell pyramiding, metabolic bone disease linked to calcium deficiency or lack of UVB-D3, respiratory infections caused by cold and damp, internal parasites (nematodes), and egg retention (dystocia) in females.

What substrate suits this tortoise?▾

A soil/sand mix, cypress mulch, or hay and grass outdoors all work well. The substrate should be deep enough to dig into and settle in, with a rather dry surface but a slightly damp layer underneath the hide; avoid dusty substrates and permanently waterlogged ground.

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