Greater gliders are found along the eastern coast of the Australian mainland, from eastern Queensland to southern Victoria (Nowak, 1999; Troughton, 1966).
Greater gliders are generally restricted to fairly expansive tall eucalyptus forests, and are never found in the rainforest (Grzimek, 1990). Patches of old growth must be at least 20 ha to sustain a population (Possingham, et al. 1994). Greater gliders are associated with high basal areas of over-story, and they need large patch sizes of old-growth forest. They are most often found in sites containing many trees with hollows. A single glider may use 4-18 den sites (Incoll et al., 2001; Lindenmayer et al., 1993).
Greater gliders are the largest of the gliding possums. Females have a well-developed pouch and two mammae.are about the size of a domestic cat, weighing 1-1.5 kg as adults. The head and body length is 300-480 mm and the tail is 450-550 mm long (Nowak, 1999). These marsupials have a short snout and large round ears covered by thick fur (Strahan, 1995). The patagium, which is also covered with fur, extends from the knee to the elbow, (unlike the Petauridae, in which it extends from the ankle to the wrist), giving the glider a triangular shape when in the air (Berra, 1998). The long, furred tail, which is not prehensile, is used as a rudder (Grzimek, 1972). Color varies more than that of any other marsupial. The very long, dense fur is typically brownish-black, but can range from pure black with a creamy underside, to dusky browns and grays, cinnamon, red, yellow, and completely white (Grzimek, 1972; Troughton,1966).
Males and females will normally share a den from the onset of breeding until the young emerge from the pouch (Strahan, 1995). Some males are monogamous while others are bigamous, although there is no paternal care given to the young (Nowak, 1999).
Breeding season begins in March, and a single young is born between April and June. The offspring rides in the mother’s pouch until September, suckling on one of the two teats, then rides on the mother’s back until November or December. In January it reaches the age of independence. Sexually maturity is reached at two years of age. Until weaning, approximately half of the offspring produced are male. After the weaning period, the proportion of the population that is male drops precipitously to 39% (Hand, 1990; Tyndale-Biscoe and Smith, 1969).
As in all marsupials, the young are born highly altricial in most respects. Development must be completed in the mother's pouch, rather than in the uterus, as it is in placental mammals. The single offspring is nursed in the pouch until September, when the young glider emerges at 150 g to ride on its mother’s back. In November-December, when about 300 g, the young leaves its mother’s back and becomes more independent. In January, at about 600 g, the young is able to live independently. (Tyndale-Biscoe and Smith, 1969).
Longevity may be up to 15 years in the wild (Nowak, 1999).
Gliders are solitary arboreal animals, with a home range of 1-2.2 ha. Home ranges of females overlap, whereas males maintain separate territories (Incoll et al., 2001). They nest in hollows high up in both living and dead trees. The hollows are occasionally lined with strips of bark or layers of leaves (Troughton, 1966).may transport nesting material rolled-up in their tails (Nowak, 1999).
Greater gliders are clumsy and slow on the ground, but they are at home in the trees and in the air. During gliding, they bend their forearms, with the hands almost meeting in front of the chest (Grzimek, 1972; Nowak, 1999). They use their long, furred tail as a rudder (Troughton, 1966).
Greater gliders use their patagium as a blanket to reduce heat loss by wrapping it around themselves. On hot days, they will lick their fur to lose heat through evaporation (Grzimek, 1990).
Greater gliders are folivores, feeding almost entirely on eucalyptus leaves that they break down with bacterial fermentation in an enlarged cecum (Berra, 1998; Lindenmayer et al., 1999; Possingham et al., 1994). This specialized diet means they are very difficult to keep in zoos (Grzimek, 1990). Greater gliders rarely need to drink (Strahan, 1995).
Owls may represent the largest threat to gliders. Powerful owls and sooty owls both prey upon them. Dingos and introduced foxes also take. Because they are gliders, it is likely that they can escape predators by "flying" away.
The role of these gliders in the ecosystem has not been evaluated. However, they do eat eucalyptus leaves, maing the energy stored in those leaves available to their predators.
Although the fur is long and thick, it is rather loose and soft which makes it difficult to work with. Luckily for greater gliders, fur traders rarely wanted their skins (Strahan,1995).
Since greater gliders require large patches of old growth habitat (Possingham et al., 1994), their needs can conflict with those of humans who wish to cut the trees for timber.
Although widespread and abundant in some areas, greater gliders are very sensitive to clear-cuts and fragmentation of their old-growth habitat. Their conservation is entirely dependent upon the responsible management of the old growth forests in which they live (Kavanaugh and Bamkin, 1995; Strahan, 1995). Tyndale-Biscoe and Smith (1969) showed that over 90% of gliders displaced by a clear-cut die rather than establish a new territory in suitable habitat nearby. Greater gliders may have difficulty migrating through unfavorable habitat for several reasons. They are specialist feeders, and only eat the leaves of some eucalyptus trees. They only carry limited quantities of body fat, and are likely to undergo rapid changes in body condition under adverse conditions, such as with dispersal. They are also very clumsy on the ground, and so have difficulty in crossing open tree-less areas (Lindenmayer et al., 1999).
Greater gliders were previously classified as Schoinobates volans until 1982, when the generic name was changed to Petauroides (Nowak,1999).
Juliet Nagel (author), University of Wisconsin-Stevens Point, Chris Yahnke (editor), University of Wisconsin-Stevens Point.
Living in Australia, New Zealand, Tasmania, New Guinea and associated islands.
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
uses smells or other chemicals to communicate
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
parental care is carried out by females
union of egg and spermatozoan
an animal that mainly eats leaves.
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
An animal that eats mainly plants or parts of plants.
fertilization takes place within the female's body
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
Having one mate at a time.
having the capacity to move from one place to another.
the area in which the animal is naturally found, the region in which it is endemic.
active during the night
having more than one female as a mate at one time
breeding is confined to a particular season
remains in the same area
reproduction that includes combining the genetic contribution of two individuals, a male and a female
uses touch to communicate
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
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Strahan, R. 1995. Mammals of Australia. Washington, D. C.: Smithsonian Institution Press.
Troughton, E. 1966. Furred animals of Australia. Narbeth, Pennsylvania: Livingston Publishing Company.
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