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GLIDERS
Feathertail Glider
Greater Glider
Mahogany Glider
Squirrel Glider
Sugar Glider
Yellow-bellied Glider
MAHOGANY GLIDER

Mahogany Glider
Photo © Daryl Dickson

(Petaurus gracilis)

The mahogany glider is named for its rich brown mahogany colour and the importance of the swamp mahogany tree, Lophostemon suaveolens, in its habitat. The scientific name Petaurus gracilis means slender rope dancer. They have been known to glide up to 60 metres with an average glide distance of 30 metres.

The mahogany glider is one of Australia's most threatened mammals and Queensland’s only listed endangered glider species. It is found only in a very restricted area of coastal woodland in far north Queensland. First specimens were recorded in 1883, and then all record of the species laid unnoticed by science for more than 100 years until their rediscovery in 1989. The management of this species and its habitat require immediate and ongoing attention to prevent their continued decline towards extinction.

Description

The mahogany glider looks similar to the squirrel glider but has a longer, very slender tail. This glider is significantly larger than the squirrel glider.

Body measurements:

  • Head-body length, males 230-275 averaging 254 mm, females 225-270 averaging 248 mm
  • Tail length, males 335-395 averaging 370 mm, females 345-405 averaging 377 mm
  • Weight, males 330-500 averaging 407 grams, females 310-454 averaging 365 grams

Mahogany Glider
Photo © Daryl Dickson

Unlike the squirrel glider the mahogany glider's colour can vary from overall mahogany brown to grey-brown on their backs, with a black dorsal stripe. The colour on the belly also varies from cream in young animals to buff and apricot colour.

The gliding membrane extends from wrist to ankle.

Identification

Droppings are 17mm x 5mm, often with gum bands. When spotlighted they have a pale red eye shine. They are primarily silent animals and rarely call; calls consist of coarse grunts 'na-when', 'hoy', 'urga', 'aargh' and 'tzzz-tzzz' (young) sound. Their 'Nwarr' call is similar to the squirrel glider.

Ecology and Behaviour

Habitat

  • The glider’s habitat is tropical lowland open eucalypt and melaleuca woodland.
  • 80% of mahogany glider habitat has been cleared for agriculture (pine plantation, cane farms, bananas, pineapples, improved pasture, and aquaculture).

Breeding

Breeding season usually occurs from April to October. Males breed with one female per breeding season, and they generally have 1 litter per year. They may raise a second litter if the first is lost. Litter size usually 2 young, which are weaned at 4-5 months.

Data is still being collected to define the longevity of this species in the wild. They reach sexual maturity at 12-18 months of age.

Diet

The mahogany glider feeds on nectar, pollen, plant exudate, insects and honeydew, and Acacia seed arils.

  • They require a wide range of plant species that produce food at different stages of the year to survive.
  • Plant exudates include acacia gum and wattle, albizia and grasstree sap.
  • Honeydew is a sugary coating on leaves made by scale insects.
  • Acacia seed arils are the protein-rich stringy structures by which seeds hang in the pod.
  • They have been seen breaking open the leaf nests of green tree ants to steal the stored arils (high in protein) of acacia seeds and possibly the ant eggs.
  • They will travel on average 1.5 kilometres a night in search of food.
  • They spend 44% of their time feeding and foraging for food.

Mahogany Glider Den
Photo © Daryl Dickson

Home Range and Family Groups

Mahogany gliders are territorial animals within their home range and will seasonally utilize between 2-9 den trees within their territory. Unlike squirrel and sugar gliders they do not den with larger family groups and will only share their dens with a breeding partner and the immature young of the season. They often den alone. Dens are found in mature trees and are often lined with eucalypt leaves.

In a non-fragmented habitat the average home range size for a male is 19.25 hectares, for a female is 20.34 hectares and for a coupled male and female 23.15 hectares. In contrast in fragmented habitats the home range size of a male is 11.05 hectares, female 6.80 hectares and a coupled male and female 11.60 hectares.

Natural predators in their range are owls, pythons, and goannas.

Distribution

The mahogany glider has the smallest distribution of all glider species in Australia.  They are found in a very restricted area of far north Queensland. They are known to occur between Ollera Creek (40 km south of Ingham) and Hull River near Tully.

Threats

  • Feral predators such as cats and dogs
  • Habitat fragmentation
  • Habitat clearing & loss of mature den trees
  • Habitat degradation (woody weeds & rainforest incursion into the very limited existing habitat)
  • Barbed wire fences (many gliders die a slow and terrifying death trapped by their gliding membrane on barbed wire)

Conservation Status

The mahogany glider is listed as 'Endangered' under the Queensland Nature Conservation Act 1992 (NCA) and the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act).

With such a limited distribution and the ongoing effects of past, extensive habitat clearing, the future of this species will rely on our ability to manage remaining essential habitat, restore connectivity and hopefully create new viable habitat for the future.


Nest Box Installation
Photo © Daryl Dickson

Mitigation Practices

  • Conservation of remaining habitat and habitat corridors
  • Restoring connectivity – creating corridors between isolated habitat
  • Establishment of appropriate fire regimes
  • Woody weed management
  • Replacement of barbed wire with plain wire
  • Community Education & awareness
  • Installation of nest boxes

Bibliography

  • Jackson, S. M., and Jackson, C.N. (2002). Time allocation to foraging in the mahogany glider Petaurus gracilis (Marsupialia, Petauridae) and a comparison of activity times in exudivorous and folivorous possums and gliders. Journal of Zoology London 256: 271-277.
  • Jackson, S. M. (2001). Foraging behaviour and food availability of the mahogany glider Petaurus gracilis (Petauridae: Marsupialia). Journal of Zoology London 253: 1-13.
  • Jackson, S. M. (2000). Population dynamics and life history of the mahogany glider, Petaurus gracilis, and the sugar glider, Petaurus breviceps, in north Queensland. Wildlife Research 27: 21-37.
  • Jackson, S. M., and Claridge, A. (1999). Climatic modelling of the distribution of the mahogany glider (Petaurus gracilis), and the squirrel glider (P. norfolcensis). Australian Journal of Zoology 47: 47-57.
  • Jackson, S. M. (1999). Glide angle in the genus Petaurus and a review of gliding in mammals. Mammals Review 30: 9-30.

  • Isaac, J. L., Parsons, M., and Goodman, B. A. (2008). How hot do nest boxes get in the tropics? A study of nest boxes for the endangered mahogany glider. Wildlife Research 35: 441-445.
  • Parsons, M., and Latch, P. (2007). Recovery plan for the mahogany glider Petaurus gracilis. Report to Department of the Environment, Water, Heritage and the Arts, Canberra. Environmental Protection Agency, Brisbane.

More Information