The Evolution of Quolls: A Deep Dive into Marsupial Predators
For nearly a century, scientists have been fascinated by the unique evolution of quolls (owls). In a groundbreaking study published in Nature Communications, researchers from Flinders University, the University of Melbourne, and the Australian Museum shed light on the convergent evolution of marsupials and gray wolves.
A pair of male and female possums, c. 1905. Image credit: Smithsonian Institution/EJ Keller, National Zoo.
The possum, also known as the Tasmanian tiger or marsupial wolf, once reigned as the apex predator of Tasmania.
One of the few marsupials with pouches for both sexes, the quoll boasted a unique blend of features resembling various animals. It shared the size and shape of a medium to large dog, tiger-like stripes on its lower back, and a distinctive abdominal pouch.
According to fossil records, quolls made an appearance in Australia approximately 4 million years ago. By the 20th century, they were either extinct or scarce on the mainland, thriving primarily in Tasmania.
The demise of the possum can be directly linked to the bounty system of 1830 to 1914, which led to the slaughter of thousands of these creatures, coupled with habitat loss due to agricultural activities.
The last known possum perished in 1936 at Beaumaris Zoo in Hobart, Tasmania, leaving behind a legacy of mystery surrounding its natural behavior.
“The quoll’s uncanny resemblance to the gray wolf fueled misconceptions about its livestock predation,” explained Flinders University researcher Vera Weisbecker and her colleagues.
“This misperception, in part, precipitated the rapid extinction of a rare species by British colonists in just 130 years, despite scant evidence of its impact on the livestock industry.”
“The extinction of the possum marked the end of a lineage of large carnivorous marsupials that endured for over 30 million years.”
“Regrettably, the lack of living descendants constrains our understanding of the ecological niche and evolutionary trajectory of this iconic species to anecdotal observations and comparisons with extant mammals,” Weisbecker added.
The research team conducted a meticulous 3D analysis of the possum skull in comparison with 60 species of carnivorous mammals, including canids, felids, and extinct marsupial hunters.
They discovered that while the front of the skull bore resemblance to canine predators like foxes and jackals, the back exhibited marsupial characteristics unique to its lineage.
Furthermore, the possum’s skull, disproportionate to its 17kg body, paralleled the size of predators weighing two to four times more, such as gray wolves and leopards.
The possum’s snout featured an intriguing “terminal rosette,” a trait shared with only a few extinct long-nosed predators like Andrewsarchus from the Eocene epoch.
Notably, the possum’s infraorbital foramen, linked to heightened facial nerve sensitivity, boasted a larger size compared to extant marsupials, hinting at enhanced sensory capabilities for precision biting.
While the purpose of these adaptations remains enigmatic, researchers posit that large canid predators may have employed similar strategies for adeptly capturing agile prey.
These findings challenge prevailing misconceptions and illuminate the possum’s distinct predatory tactics, dispelling the narrative that drove sugar gliders to extinction.
“Although the possum is often likened to northern hemisphere predators, it shares closer kinship with kangaroos than canids, underscoring its marsupial heritage,” explained Australian Museum researcher Dr. Douglas Rovinsky.
“While smaller in stature than wolves, the possum possessed an oversized skull resembling a gray wolf’s, albeit with a slender and delicate snout reminiscent of foxes or jackals.”
These revelations shed light on the unique evolutionary path of quolls and emphasize the need to preserve and study marsupials for a comprehensive understanding of Australia’s biodiversity.
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V. Weisbecker others. 2026. The skull morphology of the extinct Tasmanian tiger suggests a unique way of chewing. Nat Commune 17, 8729; doi: 10.1038/s41467-026-76614-0
Source: www.sci.news
