Bandicoots and bilbies evolved significantly different snout shapes due to millions of years of adaptation to diverse environments across Australia and New Guinea, according to phys.org reporting. A study comparing 127 skulls from 25 living and extinct species revealed that climate, location, and body size account for roughly 35% of these anatomical variations.
For decades, small digging marsupials have been grouped together in the public imagination as essentially uniform creatures. Researchers at Murdoch University’s Harry Butler Institute examined 3D scans of skulls to test whether that visual similarity held up under rigorous geometric morphometric analysis. The findings, published in the Zoological Journal of the Linnean Society under the DOI 10.1093/zoolinnean/zlag172, proved that skull shape varies widely across the group.
How Snout Morphology Drives Foraging Behavior
The length and shape of a snout dictate how these marsupials interact with their substrate. A quenda possesses a short, sturdy snout suited for heavy excavation. In contrast, Perameles bandicoots and bilbies sport much longer, narrower skulls.
For animals that spend a lot of their time searching and digging for food, the snout is an important part of how they interact with their environment. A long, narrow snout may help an animal probe through soil and fallen leaves for food, while a shorter, stronger snout may be better suited to digging.
Those physical distinctions do not scale linearly with body mass. The study showed the differences weren’t simply because some species were bigger than others.
Extinct Lineages Reveal Greater Ancient Diversity
The dataset went beyond extant species to incorporate extinct specimens, establishing that past bandicoots and bilbies displayed even broader anatomical extremes than today’s surviving populations. The extinct pig-footed bandicoots, known scientifically as Chaeropus, exhibited skull proportions unlike those seen in any bandicoot or bilby alive today. These fossils demonstrate that contemporary diversity represents a smaller fraction of a once much wider anatomical diversity.
A skull acts as a historical archive recording ancestry, feeding mechanics, and sensory evolution. Comparing cranial structures across both extinct and living taxa allows researchers to understand how these animals have adapted over evolutionary time.
