Why the quokka is not a rat—and how it got its name

The word quokka and the place name Rottnest tell two very different stories about the same animal. One name comes from the language of the people who have known southwestern Australia for millennia. The other grew from a European visitor looking at an unfamiliar marsupial and seeing a very large rat.

That mistake survived on the map. The animal, happily, remained a quokka.

Where does the word “quokka” come from?

On Wadjemup—widely known as Rottnest Island—the animal is kwoka in Noongar. The English spelling quokka records that Indigenous name in a form that English speakers can read. It is pronounced KWOK-uh.

That makes quokka part of a large and important group of Australian English words adopted from Aboriginal languages. The word did not need to be invented by a visiting naturalist. A name was already there.

Why is it called Rottnest Island?

The island’s European name came from a much less accurate description. In 1696, Dutch sea captain Willem de Vlamingh landed on the island and mistook its abundant quokkas for giant rats. He gave the place a Dutch name meaning “rat’s nest,” which became Rottnest.

The mix-up is understandable at a glance. Quokkas have compact grey-brown bodies, rounded ears, dark eyes, and a tapering tail. But biologically, the comparison falls apart.

A quokka is a wallaby, not a rodent

The quokka’s scientific name is Setonix brachyurus. It is a marsupial in the same family as kangaroos and wallabies, and the Australian Museum describes it as one of the smallest wallabies. Like its relatives, it moves with a bounding gait and raises its young in a pouch.

Its short tail helps explain the second half of the scientific name: brachyurus is built from Greek roots meaning “short” and “tail.” The animal’s shape fooled a seventeenth-century sailor, but its anatomy tells a different story.

Is a quokka really smiling?

Quokkas are often promoted as the “world’s happiest animal.” That nickname comes from a facial expression that looks remarkably like a grin in photographs. Perth Zoo describes it more carefully as a content-looking expression.

It is safer to treat the smile as human interpretation, not a reliable report of the animal’s mood. A quokka is still a wild animal going about its own life, not posing for a reaction image—even when the photograph seems to suggest otherwise.

The night-climbing fact the selfies miss

The familiar quokka photo is usually taken at ground level in daylight. That picture leaves out two of the animal’s more surprising traits: quokkas are mainly nocturnal, and they can climb trees to reach food.

They are herbivores that browse grasses, leaves, stems, and bark, with a taste for tender new growth. On Wadjemup they are adapted to a dry environment and can endure long periods with little fresh water. During the day they commonly shelter in dense vegetation, then become more active around dawn, dusk, and night.

So the internet celebrity with the permanent smile is also a night-moving, tree-climbing browser built for a demanding landscape.

Famous does not mean safe

Quokkas are strongly associated with Wadjemup, but they also live in scattered parts of southwestern Western Australia and on Bald Island. Their conservation status is vulnerable. Mainland populations have been hit especially hard by habitat loss and introduced predators such as foxes.

The island’s protected population is easier for visitors to see, which can make the species look more secure than it is. Rottnest Island’s guidance is simple: observe quokkas from a respectful distance, and do not touch, feed, or give water to them.

The most memorable fact about quokka may therefore be the contrast inside its names. Kwoka connects the animal to Noongar language and country. Rottnest preserves a visitor’s mistake. Put together, they show how a word can carry not just a definition, but a history of who was looking—and how closely they looked.