Are Tasmanian Devils Dangerous to Humans?

Tasmanian devils look and sound far more intimidating than they actually are to people. These stocky marsupials, roughly the size of a small dog, possess one of the strongest bites relative to body size of any living mammal, yet documented cases of unprovoked attacks on humans are essentially nonexistent. Devils are shy, predominantly nocturnal scavengers that, when studied in controlled experiments, flee from the sound of a human voice more readily than from almost any other stimulus. The real risks of a devil encounter are narrow and specific, and understanding them says more about the animal’s ecology and oral microbiology than about any predatory threat.

A Bite Built for Crushing Bone

The reputation starts with the jaws. A comparative study of bite force across large biting mammals found that when bite strength was adjusted for body mass, the Tasmanian devil ranked highest among all living species tested.¹ A devil weighing around 8 to 14 kilograms can generate a bite that, pound for pound, outperforms animals many times its size. That jaw power is not built for attacking large prey. It evolved for a specific dietary niche: eating carcasses whole, bones and all. The devil is the only Australian mammal and the only marsupial with skeletal specializations for bone consumption.²

Biomechanical analysis of the devil’s skull reveals an interesting trade-off. While the animal produces remarkably high bite forces for its size, the stresses those forces place on its own skull are also surprisingly high. Researchers have found that a higher proportion of spongy bone in the devil’s skull likely absorbs some of the shock from biting through hard material, but this comes at the cost of reduced overall skull rigidity.³ In other words, the devil’s skull is tuned for its scavenging lifestyle, not for subduing struggling prey. A devil that bites a human hand or arm could certainly cause a serious wound and break small bones, but it is not mechanically equipped for the kind of sustained, crushing attack that a predator of large animals would deliver.

Scavenger by Nature, Hunter by Opportunity

People often picture Tasmanian devils as aggressive predators, partly because of their gaping-jaw threat displays and the loud, unsettling shrieks they make when competing over food. In reality, video collar research tracking wild devils during their nightly foraging revealed that they spend more time scavenging than actively hunting.² Their foraging behavior is opportunistic and flexible. When they do hunt, they tend to target small to medium-sized animals like wallabies, possums, and birds, using short, fast pursuits rather than prolonged chases.⁴

The open-mouth yawning and screaming that people find so alarming are social displays, not signs of imminent attack. Devils use these behaviors mainly toward other devils, especially when multiple individuals converge on a carcass. Communal feeding at a large carcass can be noisy and chaotic, with devils snapping at each other, but these confrontations rarely escalate to serious fighting even among the devils themselves, much less toward a human bystander. The famous screech is closer to an argument over dinner than a war cry.

Devils Are More Afraid of You Than You Are of Them

If you encounter a devil in the bush, the animal’s most likely response is to run. A 2024 study testing fear responses in Australian marsupials found that native species, including Tasmanian devils, were far more frightened of human voices than of any non-human predator sound. When researchers played recordings of humans speaking alongside recordings of dogs barking and other predator cues, native marsupials were more than twice as likely to flee from the human recordings compared to dog sounds. In fact, the marsupials tested were about three times more likely to flee from human voices than from recordings of Tasmanian devils themselves.⁵

This pattern fits with a broader body of research showing that wildlife around the world perceives humans as a “super predator,” often reacting with more fear to human presence than to apex predators like lions, bears, or wolves. For Tasmanian devils, this means the default behavior when they detect a person is avoidance, not confrontation. The animals most commonly encountered up close are habituated individuals near tourist sites or campgrounds where food scraps attract them, not wild animals in natural settings. Even in those habituated situations, bites are rare and almost always defensive, occurring when a person deliberately handles or corners the animal.

What a Devil Bite Actually Means

Suppose the unlikely happens and a devil does bite. The immediate concern is the wound itself. Given the animal’s jaw strength, even a quick defensive snap can puncture skin deeply and potentially fracture a finger. But the more insidious risk is what lives inside the devil’s mouth. Research into the oral bacteria of healthy Tasmanian devils found that their mouths harbor members of the Pasteurellaceae family, a group of bacteria commonly associated with animal bite wound infections in general.⁶ This is similar to the bacteria found in cat and dog bites, where infection rates can be high if the wound is not properly cleaned and treated.

What makes devil bites potentially trickier to treat is the antibiotic resistance profile of their oral bacteria. Testing of isolates from the mouths of 26 healthy devils showed that a large majority of the Pasteurellaceae strains carried high resistance to several common antibiotics. Over 90% of strains showed high resistance to clindamycin, about three-quarters showed high resistance to gentamicin, and a similar proportion were resistant to amikacin.⁶ This does not mean a devil bite is untreatable. It means that if you are bitten, a doctor cannot simply reach for the first-line antibiotic off the shelf. The wound would likely need culture-guided treatment, and the treating physician should be aware that standard aminoglycoside antibiotics may not work. For wildlife handlers and researchers who work directly with devils, this information is practically important. For a tourist who stumbles across one on a trail, it is a reason to clean any wound immediately and seek medical attention, but not a reason to panic.

Parasites Devils Can Share

Beyond bacteria, Tasmanian devils carry a range of parasites, and a handful have theoretical relevance to human health. A comprehensive review of devil parasites identified several organisms worth noting.⁷ The roundworm Baylisascaris tasmaniensis has raised speculation about whether it could cause a condition called larval migrans in humans, where parasite larvae migrate through tissues, but no cases have ever been reported. The nematode Trichinella pseudospiralis, which devils can carry, is capable of infecting humans, though confirmed human cases from Tasmania have not been documented. The rat lungworm Angiostrongylus cantonensis, which can cause a serious brain infection in people, has been found in the devil’s parasite inventory as well, though here the devil is one link in a chain involving rats and snails rather than a direct transmission route to humans.

The tick Ixodes holocyclus, which parasitizes devils among many other Australian wildlife species, does pose a real (if small) hazard to humans. This tick can cause tick paralysis in people and domestic animals who are not naturally resistant. Native marsupials, including devils, are generally immune to this effect. But the risk here is not unique to devil encounters; the same tick is found on dozens of other Australian animal species. You are far more likely to pick one up from walking through tall grass than from any proximity to a Tasmanian devil.

The overall picture from parasitology is one of theoretical risk with no confirmed human cases tied directly to devil contact. For researchers who handle live animals or process devil carcasses, wearing gloves and practicing basic hygiene is sensible. For everyone else, the parasite risk is academic rather than practical.

Devil Facial Tumor Disease and People

One of the most striking things about Tasmanian devils is the transmissible cancer that has devastated their wild populations since the mid-1990s. Devil facial tumor disease, or DFTD, spreads between devils when they bite each other, passing living cancer cells from one animal to another. This raises a question many visitors to Tasmania have: can DFTD jump to humans?

There is no evidence that it can. DFTD is a clonal cell line that requires transmission between genetically similar hosts. The cancer cells survive in new devil hosts partly because the species has low genetic diversity, meaning their immune systems fail to recognize the foreign cells as invaders. Human immune systems are fundamentally different and far more genetically diverse, making cross-species transmission extraordinarily unlikely. Researchers and wildlife veterinarians who have handled hundreds of tumor-bearing devils over decades have never contracted the disease. While scientists study DFTD intensely for its implications in cancer biology and conservation, the disease poses zero known risk to human health.

Where Devils and People Actually Cross Paths

The most common interaction between Tasmanian devils and humans is not a face-to-face encounter in the bush but an indirect and often lethal one on the road. Devils are attracted to roadkill, which is plentiful on Tasmanian highways, and while feeding they become roadkill themselves. Vehicle strikes are one of the leading causes of devil mortality outside of DFTD, with some stretches of Tasmanian highway being particularly deadly. This is a conservation problem, not a human safety problem: the danger flows entirely from cars to devils, not the other way around.

For drivers in Tasmania, the practical implication is to slow down at night on rural roads, both for the sake of devils and to avoid vehicle damage. A devil carcass or a live devil on the road at highway speed can cause a surprising amount of damage to a car’s undercarriage. Some local conservation groups have advocated for wildlife crossings and roadside fencing in known hotspot areas, similar to what is used for kangaroos on the Australian mainland.

At campgrounds and picnic areas, habituated devils sometimes investigate food scraps after dark. The standard advice is the same as for any wildlife encounter: secure your food, do not feed them, and give them space. A devil that approaches your campsite is after leftovers, not confrontation. If you startle one, it will almost certainly bolt. The yawning threat display, if it occurs, is a bluff. Backing away slowly and making noise is enough to end the interaction.

How Devils Compare to Other Wildlife Encounters in Tasmania

Tasmania does not have the large predators or venomous megafauna that make parts of mainland Australia or other continents genuinely risky for hikers. There are no crocodiles, no large cats, no bears. The snake species present in Tasmania include the tiger snake, which is medically significant, but snake bite fatalities in the state are extremely rare. In context, a Tasmanian devil encounter ranks well below a tiger snake sighting on any realistic danger scale.

The research on marsupial fear responses puts this in interesting perspective. The study that found marsupials flee from human voices about three times more than from devil vocalizations was actually measuring fear in other marsupials, not in devils themselves.⁵ But the broader finding holds for Tasmanian devils too: they recognize humans as a significant threat. In the Tasmanian ecosystem, you are the apex predator. Devils know it, and they act accordingly.

Working with Devils Up Close

The people who face actual bite risk from Tasmanian devils are wildlife researchers, veterinarians, and sanctuary staff who physically handle the animals. Trapping and processing wild devils for health monitoring, especially during DFTD surveillance, involves restraining an animal with a powerful bite and a strong motivation to escape. Even experienced handlers get bitten occasionally. The protocols in place reflect this reality: thick leather gloves, proper restraint techniques, and the understanding that any bite should be thoroughly cleaned and assessed for infection given the resistant bacteria in the devil’s mouth.⁶

Wildlife sanctuaries that allow tourists to observe feeding sessions typically maintain barriers between visitors and animals. Some sanctuaries offer supervised experiences where visitors can touch or hold a devil, but these involve calm, habituated animals and close staff supervision. The animals chosen for these interactions are selected for temperament, and incidents are vanishingly rare. If anything, the bigger risk at such events is to the devil’s welfare rather than the visitor’s safety, as handling causes the animal stress.

For the occasional hiker, camper, or rural resident who sees a devil in the wild, the practical summary is straightforward. Enjoy the sighting from a reasonable distance. Do not attempt to touch, feed, or corner the animal. If it yawns at you with its mouth wide open, recognize that as a stress signal, not an attack posture, and give it an escape route. The devil will take it.