The Thylacine's Skull Was No Wolf Copy

The Discovery

The extinct thylacine is a textbook image of convergent evolution: a marsupial predator shaped like a striped dog. A new analysis finds that the resemblance breaks apart when its skull is examined region by region.

In a Nature Communications study, researchers compared three-dimensional cranial shape across 60 species of living and extinct meat-eating mammals. The thylacine's skull proved to be a mosaic with no clear living functional counterpart.

What Makes It Strange

Its long face resembles those of foxes and other small-prey canids, while other regions retain stronger marsupial affinities. The complete package combines a relatively large head, a tall slender snout and an outward-flared region near the canines.

• The skull was less suited to stresses from holding large, struggling prey than a wolf's robust cranium.
• Its teeth emphasised slicing rather than the crushing surfaces common in many canids.
• The trait combination most closely echoes several extinct predators with long, widened jaws.
• The anatomy supports fast, high-impact snapping bites at the canines.

It wore a dog's outline over a hunting machine with no living twin.

The Implications

The result weakens the shortcut that treats the thylacine as a marsupial wolf in both form and function. Shared skull-development signals and a similar silhouette do not necessarily mean that natural selection produced the same feeding mechanics.

That matters beyond anatomy. Colonists persecuted thylacines as sheep killers, helping drive the species to extinction in 1936, despite limited evidence that they caused major livestock losses. The new work does not reconstruct every prey choice, but it adds mechanical evidence against imagining a wolf-style hunter.

What Happens Next

The study turns the thylacine into a harder evolutionary question. Researchers now need to explain how genetic and developmental similarities with wolves produced a skull whose working parts diverged so sharply.

The animal was not evolution repeating itself. It was evolution arriving at a familiar silhouette by a stranger route.