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Red-Eyed Crocodile Skink
Tribolonotus gracilis
The 'mini-dragon' of the forest abyss. An incredibly fascinating Indonesian lizard that literally looks like an armored black dragon with a brilliant glowing orange ring around its eyes. Terrified of light and heat, it is a secretive, extremely shy creature that demands cool, dark, and perpetually soaked aqua-terrariums to survive.
Class:Squamata
Order:Squamata
Family:Scincidae
Subfamily:Lygosominae
Genus:Tribolonotus
Species:Tribolonotus gracilis
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Water Temperature
22 - 26 °C
Environment
Terrestrial / Semi-aquatic
Humidity
60 - 90 %
Day temperature
24 - 27 °C
Ambient temperature
24 °C
Night temperature
18 - 22 °C
Basking spot
27 °C
Adult size
10.3 cm
Minimum enclosure
>= 100 L
UVB
Low
Species description
Geographical Origin and Habitat: Exclusively inhabits the floors of the hyper-humid rainforests of New Guinea. They live deep in the mud, beneath thick layers of decaying leaf litter or debris, often venturing into small jungle streams. They almost never see direct sunlight, living in constant twilight.
Taxonomy and Genetics: Scincidae family (Skinks). There are no commercial morphs due to breeding difficulty (they lay only one egg at a time). Although it looks like a crocodile, it is actually a timid skink. It shares its family with the Blue-tongued Skink, but the two are polar opposites in almost everything (habitat, care, behavior).
Behavior and Habits: They are crepuscular/nocturnal reptiles, extremely slow, secretive, and prone to chronic terror. The antithesis of a handling pet: if picked up, they instantly freeze playing dead (thanatosis), or they will squeak softly, and in cases of total panic, emit audible vocalizations (barking), a rare trait in lizards. They must be observed, not touched. They love water and are excellent swimmers.
Morphology: They boast a stunning fantasy appearance: 7-8 inches (18-20 cm) long, the body is covered in thick black armor (osteoderms) and 4 rows of spiny dorsal scales, making them perfect replicas of tiny crocodiles or black dragons. The defining trait in adulthood is a brilliant fire-orange ring surrounding their huge eyes. Dimorphism is hidden: males have whitish porous pads under the toes of their hind legs (volar pores) and a white belly patch, which females lack.
Care, breeding and tankmates
Terrarium Setup: A highly elaborate but dimly lit aqua-terrarium (e.g. a 36x18x18 inch tank). The substrate is the vital core: it needs 4-6 inches (10-15 cm) of peat moss, coco coir, and sphagnum moss covered by an extremely deep layer of dry leaves and hollow cork bark. They must be able to bury themselves completely anywhere. A WATER FEATURE (taking up at least a third of the terrarium and 2-3 inches deep) is mandatory, as they regularly submerge to soak, molt, and hunt earthworms.
Lighting and Heating: HEAT KILLS THEM. They are damp undergrowth reptiles. The ideal is to keep the room between 73°F and 78°F (23-26°C). Any temperature above 82-84°F (28-29°C) will cause fatal heat stroke. Lighting must be very dim; a powerful blinding basking spotlight will keep them permanently hidden underground. Basking spot: max 80°F (27°C), provided via very low-wattage bulbs. UVB (low 2-5%) is recommended but must be heavily shaded by vegetation so the reptile can choose to expose itself voluntarily (crypto-basking).
Humidity and Hydration: They demand the wettest and most humid environment of almost any reptile (constant 80-100%). The enclosure must be heavily misted. If the dirt dries out or if side vents aridify the tank, the skink will suffer retained sheds that will act as tourniquets on its fragile toes or tail, leading to gangrene and necrosis of the eyeballs.
Feeding and Supplementation: Insectivorous and opportunistic. Often shy, they won't hunt in front of the owner, preferring easy or soft prey. Earthworms (chopped in bowls or in the water feature) are their prey of choice, alongside decapitated crickets, waxworms, and small snails. They will dig in the dirt to unearth insects. Supplement frequently with Calcium/D3 powder as the lack of strong UVB irradiation requires extra chemical support.
Compatibility: They form weak pairs (1 male and 1 female), and it is one of the few lizard species where parents tolerate and share underground burrows with a single hatchling (they lay only 1 colossal egg at a time, which they partially guard and incubate). Housing two adult males will lead to silent but lethal territorial biting fights in the dark.
Health and Common Diseases: Hyperthermia (heat stroke) is the number one assassin; crocodile skinks die like flies in the summer if kept in non-air-conditioned homes above 82°F (28°C). Handling stress leads to a total refusal of food. Eye infections or blindness occur if the humidity level drops below 60%, causing the eyelids to seal shut with dried retained skin.
Geographic Origin and Distribution
Exclusively inhabits the floors of the hyper-humid rainforests of New Guinea. They live deep in the mud, beneath thick layers of decaying leaf litter or debris, often venturing into small jungle streams. They almost never see direct sunlight, living in constant twilight.
Origin
Africa and MadagascarSouth and Southeast AsiaEast AsiaAustralia, New Guinea, and Oceania
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 10.3 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 10.3 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 10.3 cm for this species, recorded as snout–vent length (SVL). These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
