Reptile atlas

Geographical Origin and Habitat: Manouria emys is native to the dense, humid tropical rainforests of Southeast Asia, with populations distributed across Indonesia (Sumatra and Borneo), Peninsular Malaysia, southern Thailand, and Myanmar. It primarily inhabits moist montane forest zones, thick undergrowth, and areas near freshwater streams, marshes, and swamps, where it frequently wallows in mud.

Taxonomy and Genetics: Belonging to the family Testudinidae, it is considered one of the most ancient and primitive evolutionary lineages among living tortoises. Two subspecies are recognized: *Manouria emys emys* (Asian Brown Tortoise) and *Manouria emys phayrei* (Burmese Brown Tortoise, which is the larger variant, reaching weights up to 37 kg).

Behavior and Habits: Primarily crepuscular and nocturnal, it avoids direct midday sunlight by sheltering under damp leaf litter. It exhibits semi-aquatic behaviors rare among tortoises. Females display unique maternal care, building large nesting mounds from organic debris and actively defending them from potential egg predators.

Morphology: This is the largest land tortoise species in Asia. It features a massive, dark brown, olive-green, or black carapace, heavily armored limbs covered in large spiny scales, and prominent tubercular spurs on its thighs. The head is large with a robust snout, suited for foraging through forest undergrowth.

Terrarium Setup: Due to their massive size, adults require spacious outdoor enclosures or large indoor pens of at least 1500 liters (or 4x3 meters of floor space per tortoise). The substrate must be soft, organic, and at least 30 cm deep, consisting of peat moss, cypress mulch, and damp leaf litter. A large, shallow water pool for complete soaking is essential.

Lighting and Heating: Provide moderate-intensity UVB lighting and a dedicated basking zone. Daytime ambient temperatures should range between 24 and 28 °C, with a localized basking spot at 32 °C. Nighttime temperatures should not drop below 20 °C. As forest dwellers, they require shaded areas to prevent overheating.

Humidity and Hydration: Maintain high relative humidity levels of 70% to 90% constantly. Regular misting once or twice daily is required, and the substrate should remain damp but not waterlogged. The soaking pool water must be replaced daily as these tortoises frequently defecate while bathing.

Feeding and Supplementation: Primarily herbivorous but highly opportunistic. Their diet should include broadleaf weeds, dark leafy greens (dandelion, endive), forest mushrooms, fallen fruits, and occasionally small invertebrates. Supplement the diet with calcium powder and vitamin D3 twice a week for growing juveniles.

Compatibility: Generally peaceful and can be housed in small groups if space permits, though adult males may display territorial aggression during the breeding season. Do not mix with species from arid environments or animals that could injure or stress this docile tortoise.

Health and Common Diseases: Highly susceptible to respiratory infections (pneumonia) if exposed to cold, dry drafts. Poor sanitation and waterlogged substrate can lead to shell rot (plastron infections) and skin fungus. Regularly inspect the shell integrity, eye clarity, and beak growth.