Wombats use their cube-shaped poop to recognize each other

Wombats are antisocial creatures. They live alone, avoid each other except to mate, and shuffle between burrows every few days. Yet somehow, these Australian marsupials manage to communicate across their solitary lives—through a messaging system that happens to be feces.

Researchers at the University of Georgia have spent the last few years investigating exactly how. Their discovery: wombats deposit their distinctively square droppings in communal latrines scattered across southeastern Australia, and these piles function as a kind of chemical bulletin board.

"If you're a solitary animal, how do you communicate with others around you? Maybe you just poo," says Scott Carver, who leads the research and previously won the Ig Nobel Prize for physics for investigating how wombats produce cube-shaped feces in the first place.

The chemistry of recognition

The key to this system lies in wombat anatomy. Their skulls contain a vomeronasal organ—a sensory structure that gives them an exceptional sense of smell, far sharper than what we rely on. When researchers analyzed wombat droppings using gas chromatography and mass spectrometry, they found 44 distinct chemical compounds. Each wombat's poo carries a unique chemical signature, like a scent fingerprint.

To test whether wombats actually use these signatures to recognize each other, the team ran a simple experiment. They collected droppings from a distant latrine and placed them in a new location, then set up wildlife cameras to watch what happened. The wombats spent significantly more time investigating latrines that contained feces from unfamiliar individuals—evidence that they could detect a stranger's arrival just by smell.

"We were able to show that there are individually distinct chemical signatures in wombat poo," Carver explains. "Wombats have good sensory structures for smell and individually distinct chemical mixtures, so they can probably tell individuals apart."

The researchers suspect these chemical messages convey far more than just identity. Sex, age, and reproductive status likely all factor into what a wombat can read from another's droppings. The square shape itself probably plays a role too—it prevents the feces from rolling away, keeping the message in place at prominent landmarks like logs or rocks where wombats naturally gather.

This research opens a window into a sensory world most of us will never experience. Your dog stops to sniff a bush for what feels like forever, and you're left wondering what it's detecting. Wombats are doing something similar, but with their own biological innovation: turning a basic biological function into a sophisticated communication network that lets solitary animals stay connected without ever having to meet.

The next phase will involve decoding what each of those 44 chemical compounds actually means to a wombat—work that could reveal how other mammals use scent to navigate their social lives.