File-eared Tree Frog

Geographical Origin and Habitat: Polypedates otilophus, commonly known as the file-eared tree frog, is native to the primary and secondary tropical rainforests of Southeast Asia, with established populations in Borneo, Sumatra, and Java. This species primarily inhabits the forest canopy and middle-story vegetation, often found near temporary rain pools, peat swamps, or slow-moving forest streams. It is a strictly arboreal amphibian, descending to the ground or lower vegetation almost exclusively during the breeding season to reproduce.

Taxonomy and Genetics: Belonging to the class Amphibia, order Anura, family Rhacophoridae, and genus Polypedates. Taxonomically, it is distinguished by the prominent, serrated bony ridges located above the tympanum, from which its scientific and common names are derived. Genetic studies indicate a close evolutionary relationship with other Asian tree frogs that construct foam nests to protect their eggs from desiccation and ground predators.

Behavior and Habits: This species is strictly nocturnal. During the day, it remains completely motionless and camouflaged on leaves or high branches, tucking its limbs beneath its body to minimize moisture loss. It becomes active at dusk, leaping with agility through the canopy using adhesive toe discs. During the breeding season, males produce deep, rasping advertisement calls from branches overhanging water to attract females.

Morphology: This is a large tree frog species, with adult females reaching lengths of 8 to 10 centimeters, while males are smaller, ranging from 6 to 8 centimeters. The skin is pale yellow-brown, ochre, or tan, marked by numerous fine, dark longitudinal lines on the dorsum and dark transverse bars on the limbs. The most defining feature is the sharp, serrated bony projection behind each eye, situated above the tympanic membrane.

Terrarium Setup: Requires a vertically oriented terrarium (tall tank) measuring at least 60x45x90 cm for a pair. The substrate should consist of damp coconut coir, peat moss, or sphagnum moss topped with leaf litter. It is essential to provide numerous live, broad-leaved plants (such as Pothos and Philodendron), sturdy vertical and diagonal climbing branches, and cork bark tubes to create high-level hiding spots.

Lighting and Heating: Being nocturnal, they do not require intense UVB lighting, but a low-output UVB bulb (2.0) is recommended to maintain natural circadian rhythms. Maintain daytime temperatures between 24 °C and 28 °C in the upper areas, with a drop to 20-22 °C at night. Heat should be provided using a thermostatically controlled heat mat attached to the outside wall of the enclosure.

Humidity and Hydration: Demands high relative humidity levels between 70% and 90%. This is achieved by misting the enclosure with dechlorinated or reverse osmosis water twice daily, or by using an automated misting system. A large, shallow water dish filled with fresh, dechlorinated water must always be present on the bottom for soaking. Change the water daily.

Feeding and Supplementation: The diet should consist of a variety of live, gut-loaded insects of appropriate size: crickets, locusts, roaches (discoid or dubia), and occasional mealworms. Dust insects with a high-quality calcium and Vitamin D3 supplement twice a week for juveniles and once a week for adults. Feed at night after the lights are turned off.

Compatibility: Can be housed in small groups of one male and one or two females in a spacious terrarium. Avoid housing multiple males together in small spaces, as this can cause stress due to territorial calling. Do not cohabitate with other amphibian or reptile species to prevent cross-contamination of pathogens.

Health and Common Diseases: Amphibians have highly permeable skin and are prone to bacterial skin infections (such as red-leg syndrome) if the enclosure is kept dirty or if water quality is poor. Metabolic bone disease (MBD) from calcium deficiency and dehydration are also common risks. Only handle the frogs with wet hands or powder-free latex gloves.