Overview
The Greater Glider (Petauroides volans) is the largest gliding marsupial in the world and one of the most magnificent nocturnal canopy dwellers of the Australian continent. Inhabiting the towering eucalyptus crowns of eastern Australia’s temperate and subtropical forests, this gentle, silent glider is easily recognized by its plush, teddy-bear-like furry face, colossal rounded ears, and luxurious, feather-soft coat that ranges from pure creamy white to deep sooty charcoal.
Ecologically, the greater glider occupies a specialized canopy niche equivalent to an arboreal koala with wings. Operating as a strict eucalypt folivore, it consumes tough, toxin-laden eucalyptus foliage that is indigestible to almost all other mammals, relying on specialized gut microbiomes to ferment fibrous cell walls. Capable of silent, breathtaking aerial glides spanning up to one hundred meters (330 feet), it serves as an irreplaceable indicator of old-growth forest health and hollow-bearing tree abundance.
AT A GLANCE
- Common Name: Greater Glider
- Scientific Name: Petauroides volans
- Category: Mammals
- Subcategory: Marsupials
- Size: Head-and-body length 35 to 48 cm (14 to 19 in); exceptionally long prehensile tail 45 to 60 cm (18 to 24 in)
- Weight: 0.9 to 1.7 kg (2.0 to 3.7 lb); females slightly heavier than males
- Lifespan: 10 to 15 years in the wild
- Diet: Strict folivore specialist; almost exclusively eucalypt leaves (over 95% of diet), supplemented by occasional eucalypt buds and flowers
- Habitat: Mature wet and dry eucalypt forests, montane tall open forests, and ancient eucalyptus woodlands with abundant tree hollows
- Range: Eastern and southeastern Australia, from northern Queensland south through New South Wales to central Victoria
- Conservation Status: Endangered (IUCN Red List)
Biology and Physical Characteristics
Petauroides volans displays a remarkable suite of gliding and digestive adaptations. Its fur is exceptionally long, dense, and silky, insulating the glider against freezing montane night air and causing it to appear much heavier than its actual lean, lightweight skeleton. Unlike sugar gliders (family Petauridae), whose gliding membrane (patagium) extends from the wrists to the ankles, the greater glider’s patagium extends strictly from the elbow joints down to the ankles; when leaping, it folds its forearms tightly against its chest, holding its wrists inward and steering via subtle elbow adjustments. Its immense tail is longer than its body, fully furred, and weakly prehensile, serving as an organic rudder and counterweight during high-speed banked glides. Its digestive tract features an enormously enlarged caecum that functions as a high-efficiency fermentation vat, housing symbiotic bacteria capable of breaking down cellulose and detoxifying complex eucalyptus phenolic resins.
Behavior and Ecology
Strictly nocturnal and solitary, the greater glider spends daylight hours curled inside the dark safety of large tree hollows within ancient, living eucalyptus trees. A single glider requires an extensive network of 12 to 20 different hollow-bearing trees across its two-hectare home range, rotating between them to evade predatory powerful owls (Ninox strenua) and feral cats. At dusk, it emerges to climb to the highest outer tips of the canopy, selecting the most nutritious young eucalyptus leaves. When moving between distant trees, it launches into the air with an explosive kick, gliding silently in graceful arcs and executing sharp 90-degree aerial turns before landing lightly on a target trunk with limbs outstretched. Females possess a forward-opening pouch with two teats, giving birth to a single tiny joey in autumn that remains in the pouch for four months before riding on the mother’s back until weaning.
Conservation and Human Impact
The Greater Glider was recently uplisted to Endangered on the IUCN Red List and under Australian national environmental law, having suffered catastrophic population declines exceeding 50% across much of its range over the past two decades. The species was devastated by the catastrophic 2019–2020 ‘Black Summer’ bushfires, which incinerated millions of hectares of core old-growth eucalypt forest and vaporized hollow-bearing trees that take over 150 years to form. Ongoing industrial native forest logging, land clearing for agriculture, and climate-induced heatwaves (greater gliders cannot thermoregulate in ambient temperatures above 30°C) continue to severely threaten its survival.
Interesting Factoid
Unlike other flying possums that glide with their arms stretched wide open like skydivers, the Greater Glider tucks its hands tightly against its chest and glides purely from its elbows, using its luxurious furry tail as a flight rudder to execute sharp 90-degree mid-air turns.