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Common
Wombat
The common wombat is the largest burrowing herbivorous mammal.
Indeed, it is such an accomplished burrower that early settlers
called it a 'badger', a term that is still heard today. However,
the closest relative of the wombat is, in fact, the koala. With
its short tail and legs, characteristic waddle and 'cuddly' appearance
the wombat is one of the most endearing of Australia's native
animals.
Distribution
There are three subspecies of common wombat -- Vombatus ursinus
hirsutus which is found on the mainland, Vombatus ursinus tasmaniensis
which is found in Tasmania and Vombatus ursinus ursinus which
was once found throughout the Bass Strait islands but is now restricted
to Flinders Island.
The
common wombat was once found throughout south eastern Australia
but now, partly as a result of European settlement, is restricted
further to the south. It occupies Tasmania, eastern New South
Wales and eastern Victoria with scattered populations in south
eastern South Australia and south western Victoria. There are
two other species of wombat, both found on mainland Australia
- the southern hairy-nosed wombat and the threatened northern
hairy-nosed wombat.
Wombats
can be seen in a number of our national parks, including Narawntapu
(formerly Asbestos Range) and Cradle Mountain National Park. More
information about these national parks can be found on the Parks
and Wildlife web site at www.parks.tas.gov.au .
Description
It is a fairly large, solidly built animal with a squat, round,
bear like body, small ears and eyes, and a large naked nose. Its
thick, coarse fur varies in colour from sandy brown to grey and
black, and is sometimes flecked with fawn.
Often
their true colour is obscured by the colour of the dirt or clay
in which they have been digging. On the mainland they average
1 m in length and 27 kg in weight yet can reach up to 1.2 m in
length and weights of up to 35 kg. The Tasmanian Wombat is not
as large or bulky, averaging 85 cm in length and 20 kg in weight,
while the Flinders Island wombat is smaller still at only 75 cm
in length.
They
have short legs, large paws and long, strong claws which are used
in the excavation of burrows. The forepaws are used for digging
and after pushing the dirt to one side the wombat will back out,
moving the loose dirt with both the front and back paws. It differs
from all other marsupials by having a single pair of upper and
lower incisors (front teeth). These teeth are never ground away
as they are both rootless and never stop growing; which is just
as well as the wombat often uses them for cutting through obstructions,
much like a beaver! Being marsupials, female wombats have a pouch
that in their case opens backward to prevent dirt and debris entering
while burrowing. Habitat
In Tasmania the wombat is widespread and found from sea level
to alpine areas but shows a preference for heath land, coastal
scrub and open forest, where soils favour their burrowing habits.
Wombats often dig their burrows in the areas above creeks and
gullies. Burrows can be up to 20 m long and more than 2 m below
the ground, and have numerous connecting tunnels and entrances.
There may also be more than one nest in the burrow, which they
make from sticks, leaves and grasses.
Lifestyle
Wombats are mostly nocturnal, usually coming out at night to graze
when temperatures are lower. However, in cold periods they may
sometimes be seen about during the day either grazing or basking
in the sun. They graze for between 3 and 8 hours a night, during
which time they may travel many kilometres and visit up to four
burrows within their home range to rest or tidy up the burrow.
Although they are solitary animals, with only one wombat inhabiting
any one burrow, the overlap of home ranges does occasionally result
in a number of wombats using the same burrow. To avoid the overlap
of feeding areas they use scent-marking, vocalisations and aggressive
displays. Wombats not only leave their burrow to graze but will
also spend time rubbing themselves against logs or branches. If
used often enough, these rubbing posts may be recognised by their
worn or polished appearance.
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The
distinctive cube shaped dung of the wombat is a useful indication
of its comings and goings. Any new object within a home range
is a prime target for marking with dung, particularly if it is
elevated. Fallen trees, fresh mushrooms, rocks and even an upright
stick have been found with dung on top! The cube shape means that
dung is less likely to roll off such objects.
The
rump of the wombat is covered by a very tough, thick skin. If
threatened, a wombat will dive into a nearby burrow or hollow
log, using its rump as protection from the teeth and claws of
its attacker. The wombat is also capable of crushing attackers
against the burrow roof. Their natural enemies are Tasmanian devils
and eagles, while no doubt the thylacine once preyed upon them.
Breeding
Although the wombat may breed at any time of the year, mating
most often occurs during winter. The female has 2 teats in her
pouch yet despite this, 30 days after mating, only one young is
born. The juvenile remains in the pouch for 6 months, after which
it stays with the female up until it is 18 months old. From the
time the juvenile leaves the pouch it begins to substitute increasing
amounts of plant material for milk until, when about 15 months
old, it stops suckling altogether. Sexual maturity is reached
at 2 years of age and wombats live for in excess of 5 years in
the wild. Due to the long period of time that the young is dependent
on the mother, it is likely that females only rear one young every
two years. However, if the young dies early, or if conditions
are good enough for it to leave the pouch early, she may raise
another.
Diet
The diet of the wombat is composed entirely of plant material.
Its main food is native grasses but shrubs, roots, sedges, bark
and herbs are also eaten, while moss seems to be a particular
delicacy. At times of food shortages they may dig up sections
of dead grass to get at the roots. When feeding, the front feet
of wombats are surprisingly dexterous -- they can pick up vegetation
with one foot and 'hand' it to the mouth!
Status
The wombat is common in Tasmania, particularly in the northeast
of the state. However, since settlement, they have faced resentment
from farmers as their burrows can be hazards to stock, and thousands
were killed for this reason alone. Although common at present,
the clearing of land for agriculture is reducing their range.
Wombats are killed by poison such as '1080' used in baits intended
to reduce rabbit or wallaby numbers. Dogs, indiscriminate shooters
and vehicles also take their toll.
It
is protected in all States.
How you can help
- Contain
dogs at night to prevent them roaming, particularly in areas
where wombats are known to live.
- If
wombats are causing damage to fences, heavy hinged gates can
be installed which will allow wombats to push through but prevent
less powerful animals from entering
- Drive
carefully in 'wombat country' -- apart from killing or injuring
them, wombats can damage cars.
- Occasionally
young wombats become orphaned and require nurturing. It is important
that specialist advice is obtained on their rearing and release
as they can become very boisterous if not treated correctly.
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