The Yellow-bellied Glider (Pretaurus australis) is the largest member of the Petaurus group of gliders – it’s like a large, highly active version of the smaller and more common Sugar Glider (Petaurus breviceps). It weighs considerably less than the more distantly related Greater Glider (Petauroides volans) and has long fur, giving it a fluffy appearance; some people may know it as the Fluffy Glider. Click on the image to enlarge it and hear the call of the Yellow-bellied Glider.
It has a scattered distribution across the State, with relatively fewer records in north-east Victoria, than in the species’ stronghold of East Gippsland and the Central Highlands.
The tall, wet eucalypt forests of the Strathbogie Ranges are separated from the forests of the Central Highlands and the north-east by the valleys of the Goulburn River and the Broken River, respectively. Until recently, Yellow-bellied Gliders were considered to be absent from the Strathbogie Ranges.
In 1993 a solitary, large glider was observed high in a tree in the Tourour district of the Strathbogie State Forest. It had a two-tone colouration and remained motionless for several minutes, perched on the end of a dead limb; it did not vocalize. At the time, the animal was considered to be a Yellow-bellied Glider (D. Robinson, pers. communication 1997) and this record is the more easterly of the dots in the Strathbogies on the map, above.
In hindsight and in discussion with the original observer, the animal’s behaviour (and colouration) suggests the animal to have been a Greater Glider (possibly a ‘grey phase’ individual), rather than a Yellow-bellied Glider. Greater Gliders commonly perch on exposed branches and may remain motionless for many minutes (surprising really, as they are a favoured prey item of the Poweful Owl). Yellow-bellied Gliders are usually in constant motion. Rarely staying still, they move through the forest canopy as a family group, vocalizing to keep in contact with each other. It’s often very difficult to get a good look at them, because they rarely prop for long enough to find them with a spotlight and get binoculars onto them.
In November 1996, during one of several arboreal mammal surveys being conducted by students from Goulburn Ovens TAFE (with me, Bertram Lobert), Yellow-bellied Gliders were recorded from an extensive stand of Mountain Swamp Gum (Eucalyptus camphora) at the base of Mt. Barranhet, in the Toorour district of the Strathbogie State Forest. The first indication of their presence came while spotlighting in messmate forest, far above the creek/swamp; we heard the faint, yet unmistakable gurgling-shriek of several Yellow-bellied Gliders from the swamp below.
After moving down to the swamp, we heard three individuals, calling and foraging amongst the loose bark in the Mountain Swamp Gums. These individuals moved around us as a loose group, calling softly to each other, while we stood in the darkness and listened. We then attempted to locate the animals with 100 W 12 V spotlights, only to hear them leave the area. Despite attempts over the next hour, the animals were not heard or seen again.
Several months later, a stand of mature Messmate Stringybark (Eucalyptus obliqua), adjacent to the Mountain Swamp Gum habitat, was logged. The logged area had contained many large, old, hollow-bearing trees.
Despite several surveys in the same area over the next 12 months, as well as spotlighting and listening for calls in nearby suitable habitat in the many years since 1996, no Yellow-bellied Gliders have since been recorded anywhere in the Strathbogie Ranges.
Our observations are the only confirmed Yellow-bellied Glider records from the Strathbogie Ranges. It’s not possible to say whether logging of that Messmate stand was related to the disappearance of that family of gliders, but it would now appear that Yellow-bellied Gliders are extinct in the Strathbogie Ranges.
Has anyone else seen YBG’s in the Strathbogie Ranges?