Yellow-margined Box Turtle — Care Sheet & Morphs

Husbandry requirements

Yellow-margined Box Turtle — origin: Taiwan, south-eastern mainland China and the Ryūkyū Islands (Japan). A threatened and PROTECTED species: CITES Appendix II and Annex B of the EU regulation. Acquire only captive-bred specimens with CITES documentation; wild-caught animals are regulated, fragile and to be avoided..

Terrarium temperature gradient

Night min18 °C

Cool side22–25 °C

Warm side26–29 °C

Basking spot30–32 °C

Daytime hot spot 30-32 °C under a lamp, with a gradient down to a cool zone at 22-25 °C. A night-time drop is beneficial (18-20 °C). Avoid temperatures sustained above 32 °C. In healthy adults, a cool winter period (brumation ~10-15 °C for several weeks) stimulates breeding.

Enclosure (adult)

120 × 60 × 50 cm

Humid woodland-style terrarium / terrestrial table with a shallow water area (semi-terrestrial species)

Minimum dimensions for a single adult; more floor space is always preferable. Provide hides and planted areas. Good ventilation but a closed, secure enclosure: the species climbs and digs. Avoid any purely aquatic set-up.

Humidity

60–80 %

Humid woodland atmosphere. Keep the substrate cool and moist and mist regularly, while ensuring proper ventilation: stagnant, poorly aired humidity promotes fungal infections and respiratory infections.

Substrate

Coconut fibre / untreated topsoilSphagnum (moist moss)Leaf litterCypress bark or mulch

A thick layer (10-15 cm) that retains moisture and lets the turtle burrow. Keep it moist but never waterlogged; remove droppings and refresh regularly to prevent mould and shell rot.

UVB

Recommended

Yes, recommended: a woodland/forest-type UVB tube (approx. 5%, T5 5.0) above the warm zone, to be replaced every 6-12 months. Promotes vitamin D3 synthesis and prevents metabolic bone disease.

Water source

Always available

A shallow pool or dish of water (depth not exceeding the plastron) allowing it to drink and fully immerse itself; a poor swimmer, avoid deep water. Clean and change the water daily.

Origin

Geoemydidae

Taiwan, south-eastern mainland China and the Ryūkyū Islands (Japan). A threatened and PROTECTED species: CITES Appendix II and Annex B of the EU regulation. Acquire only captive-bred specimens with CITES documentation; wild-caught animals are regulated, fragile and to be avoided.

Feeding & health

Diet

Omnivore — Earthworms, snails, slugs, insects, carrion

A varied, balanced diet (roughly half animal prey, half vegetables and fruit). Very fond of red foods (tomato, strawberry, berries). Supplement with calcium (with D3 if UVB is insufficient). Limit excess sugary fruit.

Breeding

Oviparous

Clutch 1–4 eggs/young. Very low fecundity: 1 to 4 eggs per clutch (often 1-2), large and elongated; 1 to 3 clutches possible per year. Incubation ~60-90 days at 26-28 °C; sex may be influenced by incubation temperature (TSD likely). A winter diapause favours the reproductive cycle.

Health watch points

Hypovitaminosis A (swollen eyes, puffy eyelids), common in box turtles
Metabolic bone disease / osteofibrosis (calcium or UVB deficiency)
Respiratory infections (environment too cold, damp and poorly ventilated)
Shell and plastron rot (fungi/bacteria linked to poor humidity management)
High internal parasite load, especially in wild-caught specimens (quarantine and faecal exams essential)

Morphs & genetics

Registry of 3 documented genes for Yellow-margined Box Turtle.

Albino (T-) amelanisticRec
High Red / Red Skin red phaseDom
High Yellow / GoldenDom

Pairing calculator

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

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Yellow-margined Box Turtle × Yellow-margined Box Turtle

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 yellow-margined box turtle.

Is the yellow-margined box turtle a protected species?▾

Yes, it is a threatened species listed on CITES Appendix II and Annex B of the EU regulation. Only captive-bred specimens accompanied by CITES documentation should be acquired; wild-caught animals are regulated, fragile, and should be avoided.

What size does it reach as an adult?▾

It stays modest in size: 13 to 17 cm in shell length, with a record around 19 cm. Its carapace is highly domed and its hinged plastron allows it to close completely, with females often slightly larger than males.

How long does it live?▾

It is exceptionally long-lived: commonly 40 to 60 years, sometimes more. This is a commitment measured in decades, to be seriously considered before any acquisition.

What type of habitat should it be given?▾

Unlike other box turtles of the genus Cuora, this is a semi-terrestrial woodland species: it needs a humid terrestrial terrarium of at least 120 x 60 x 50 cm with hides and planted areas, supplemented by a simple shallow water area rather than a purely aquatic set-up. The enclosure must remain well ventilated but closed and secure, since it readily climbs and digs.

Does it need a large pool?▾

No, quite the opposite: offer only a shallow pool or water dish, no deeper than the height of the plastron, so it can drink and immerse itself safely. It is a poor swimmer, so deep water must be avoided; clean and refresh the water daily.

What temperatures are needed, and does it require a winter rest period?▾

Aim for a hot spot of 30 to 32 °C, a cool side of 22 to 25 °C, and a beneficial nighttime drop to around 18 °C, avoiding any temperature sustained above 32 °C. In healthy adults, a winter brumation of several weeks at 10-15 °C also stimulates breeding.

What substrate and humidity level should be replicated?▾

It needs a humid woodland atmosphere, between 60 and 80%, with a thick layer of 10 to 15 cm of coconut fibre, untreated topsoil, sphagnum or leaf litter, allowing it to burrow. The substrate must stay moist without being waterlogged, with good ventilation to prevent fungal and respiratory infections.

Does it need UVB?▾

Yes, a woodland/forest-type UVB tube, around 5%, placed above the warm zone and replaced every 6 to 12 months, promotes vitamin D3 synthesis and prevents metabolic bone disease.

What does the yellow-margined box turtle eat?▾

Its balanced omnivorous diet combines earthworms, snails, slugs and insects with fruit and vegetables, with a marked preference for red foods such as tomato or strawberry. Supplement with calcium, with vitamin D3 if UVB exposure is insufficient, and limit overly sugary fruit.

What is its temperament like with its keeper?▾

It is one of the most endearing and interactive turtles: bold and curious, it quickly recognises its keeper and is no longer shy once acclimated.

How does it reproduce?▾

Its fecundity is low: 1 to 4 eggs per clutch, often only 1 to 2, but large and elongated, with 1 to 3 clutches possible per year. Incubation lasts 60 to 90 days at 26-28 °C, and a winter diapause favours the reproductive cycle.

What health problems should be watched for?▾

Hypovitaminosis A, common in box turtles and showing as swollen eyes or eyelids, is a major risk, as is metabolic bone disease from a calcium or UVB deficiency. Poorly managed humidity can also cause shell rot, and wild-caught specimens require quarantine with a faecal exam.

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