Tasmanian tiger too weak to hunt sheep
Tasmanian tigers had skulls too weak to hunt much more than possums, according to new
research.
The Tasmanian tiger (thylacine) jaw was too weak for it to hunt much more than possums, new
research says. (Credit: Wikimedia)
TASMANIAN TIGERS WERE INNOCENT of the crime that led many hunters to send them
to extinction in the early 20th century, a study has revealed.
The iconic thylacine was mercilessly persecuted for allegedly killing sheep. But new research
shows the carnivorous marsupial had jaws too weak to tackle anything much larger than a
possum.
Scientists believe the thylacine's inability to take down larger prey, together with loss of habitat,
largely contributed to its downfall. The paid hunters who went gunning for the animal only
finished what nature had started.
"Our research has shown that its rather feeble jaw restricted it to catching smaller, more agile
prey," says Dr Marie Attard, from the University of New South Wales (UNSW). "That's an
unusual trait for a large predator like that, considering its substantial thirty-kilogram body mass
and carnivorous diet.
1869. Thylacine shot by Weaver. LAUNCH GALLERY
Tasmanian tiger bark worse than its bite
"As for its supposed ability to take prey as large as sheep, our findings suggest that its reputation
was at best overblown. While there is still much debate about its diet and feeding behaviour, this
new insight suggests that its inability to kill large prey may have hastened it on the road to
extinction."
The findings appear in the Journal of Zoology, published on Thursday by the Zoological Society
of London.
Thylacines, nicknamed Tasmanian tigers, once ranged across Australia and Papua New Guinea
but were confined to Tasmania by the time Europeans settled in the region. Loss of habitat and
prey, and the bounty paid to hunters to kill them, have been blamed for the thylacines' extinction.
Despite its decline the thylacine did not receive official protection from the Tasmanian
government until two months before the last known specimen died at Hobart Zoo on September
7, 1936.
Thylacine too weak to hunt big prey
The scientists measured stress patterns in the skulls of a thylacine and two of Australasia's largest
remaining marsupial predators, the Tasmanian devil and the spotted-tailed quoll. Of the three, the
thylacine skull was by far the most stressed in response to simulations of struggling prey and
tearing and pulling bites.
"By comparing the skull performance of the extinct thylacine with those of closely related, living
species we can predict the likely body size of its prey," says Dr Stephen Wroe, director of
UNSW's Computational Biomechanics Research Group. "We can be pretty sure that thylacines
were competing with other marsupial carnivores to prey on smaller mammals, such as
bandicoots, wallabies and possums."
"Especially among large predators, the more specialised a species becomes the more vulnerable
it is to extinction. Just a small disturbance to the ecosystem, such as those resulting from the way
European settlers altered the land, may have been enough to tip this delicately poised species
over the edge."