Overview
Jatna’s Tarsier (Tarsius supriatnai) is a tiny, nocturnal arboreal primate endemic to the northern peninsula of Sulawesi, Indonesia. Formally described by primatologists in 2017 and named in honor of esteemed Indonesian conservationist Professor Jatna Supriatna, this diminutive forest acrobat possesses monumental glowing orb-like eyes and powerful spring-loaded hind limbs. Operating as a strictly carnivorous hunter of nocturnal arthropods, it plays a vital role in maintaining the trophic equilibrium of Wallacea’s fragile rainforest understory.
Biology and Physical Characteristics
Tarsius supriatnai is characterized by a compact, woolly body clothed in soft cinnamon-buff to smoky-gray fur, accented by a paler throat and distinct dark facial markings. Its defining biological feature is its monumental pair of forward-facing golden-amber eyes, each larger than its entire brain; because the eyes cannot rotate within their orbits, the tarsier possesses specialized neck vertebrae that allow full 180-degree head rotation in either direction. Its elongated ankle bones (tarsals) and fused lower leg bones act like biological catapults, propelling the animal over 35 times its body length in horizontal leaps between vertical tree trunks.
Behavior and Ecology
Jatna’s tarsiers are monogamous, highly territorial primates that live in small family units consisting of an adult pair and one or two young. They spend daylight hours sleeping wedged inside hollow trunks or tangled aerial roots of strangler fig trees (Ficus), emerging at dusk to forage. They communicate through acoustic morning duets composed of rhythmic, bird-like chirps and whistles, as well as complex ultrasonic calls inaudible to potential predators. When hunting, the tarsier pinpoints prey movement with independently rotating ears before pouncing with lightning speed, catching katydids and grasshoppers with both hands.
Conservation and Human Impact
The species is officially classified as Vulnerable by the IUCN due to pervasive habitat destruction across Gorontalo driven by coconut and oil palm cultivation, road infrastructure, and timber harvesting. Forest fragmentation isolates small populations, making them vulnerable to local extinction and domestic cat predation. Conservation programs in Nantu Wildlife Sanctuary and Bogani Nani Wartabone National Park focus on preserving contiguous forest corridors and community education to protect these miniature nocturnal primates.
Interesting Factoid
Jatna’s tarsier can leap more than ten feet horizontally between vertical forest vines—the human equivalent of jumping across an entire basketball court from a complete standstill.
Last updated: October 2026