Possums are hunted by a surprisingly long list of predators, from coyotes and foxes on the ground to great horned owls and hawks from above. The term “possum” gets used loosely to describe both the Virginia opossum of North and Central America and the various possum species native to Australia and New Guinea, and predator pressures differ significantly between those two groups. What unites them is a shared vulnerability to medium and large carnivores, raptors, and certain reptiles, alongside an arsenal of defenses that ranges from the famous “playing dead” act to an evolved resistance to snake venom.
Mammalian Predators in North America
The Virginia opossum’s most consistent mammalian predators are coyotes, foxes, bobcats, and domestic or feral dogs. Coyotes are probably the single most significant predator across most of the opossum’s range, which now spans from Central America up through southern Canada. Red and gray foxes take opossums as well, though they tend to target smaller or juvenile individuals. Bobcats are effective predators where their range overlaps with opossums, and in the southeastern United States, both the Florida panther and the American black bear will kill opossums opportunistically, though neither depends on them as a regular food source.
One of the more interesting dynamics is how opossums adjust their behavior around these predators rather than simply avoiding them. In suburban and urban areas with high housing density, opossum numbers actually increase even when predator abundance is high, likely because human-altered landscapes provide food subsidies and refuge. Opossums in those high-predator environments are strictly nocturnal and shift their activity to earlier in the evening, apparently compressing their active period to minimize overlap with the predators sharing their space.1Journal of Zoology. Influence of human development and predators on patterns of Virginia opossum occupancy, abundance, and activity That behavioral flexibility is one reason opossums thrive in cities even when coyote populations are booming in the same neighborhoods.
Birds of Prey
Raptors are among the most effective possum predators worldwide. In North America, the great horned owl is the most formidable aerial threat to Virginia opossums. These owls are powerful enough to kill adult opossums and are active during the same nocturnal hours. Red-tailed hawks, barred owls, and occasionally bald eagles also take opossums, though daytime raptors are a bigger threat to juveniles wandering outside the protection of darkness.
In Australia, the predator-possum relationship between owls and arboreal marsupials is even more pronounced. The powerful owl, Australia’s largest owl species, feeds almost exclusively on possums and gliders. An analysis of over a thousand pellets identified 1,225 prey items, and mammals made up about 95% of the diet. Common ringtail possums, common brushtail possums, and Krefft’s gliders alone accounted for roughly 92% of prey occurrences.2PubMed. Beyond rodents: Apex predator diet reveals possum-mediated rodenticide poisoning That level of dietary specialization means the powerful owl is, for practical purposes, a possum specialist. It hunts them from tree canopies at night, often ambushing individuals as they move between foraging trees. This also means anything that harms possum populations, like habitat loss or secondary poisoning from rodenticides, directly threatens the owl.
Snakes and Reptiles
Large snakes are a real threat to possums, particularly in warmer climates. In North America, larger species of rattlesnakes, copperheads, and water moccasins all occupy opossum habitat and are capable of killing smaller individuals. In Australia, carpet pythons are known to prey on brushtail and ringtail possums in their tree hollows, and several large species of monitor lizards will take possums when they can catch them.
But the Virginia opossum has a remarkable counter to snake predation: an evolved partial resistance to pit viper venom. Researchers studying how this resistance works found that a blood protein called von Willebrand Factor, which is one of the specific targets of hemorrhagic snake venom, has undergone unusually rapid evolutionary changes in opossum lineages known to eat pit vipers. The amino-acid substitutions in these opossums alter the protein’s charge and shape in ways that appear to weaken the bond between the protein and a toxic venom component called botrocetin.3PLoS ONE. Adaptive Evolution of the Venom-Targeted vWF Protein in Opossums that Eat Pitvipers In plain terms, the opossum’s blood chemistry has been reshaped by natural selection to make it a harder target for the venom’s clotting-disrupting effects. This does not make opossums invincible against snakes, but it gives them a fighting chance in encounters that would kill most similarly sized mammals.
Invasive Predators and the Australian Problem
Some of the most devastating predators of possums are species that were introduced by humans into ecosystems where possums had no evolutionary experience with them. In Australia, the red fox was released in 1871, and its subsequent spread across most of the continent coincided with dramatic declines in medium-sized mammals, birds, and tortoises. Removal experiments, particularly those involving rock-wallabies, have provided clear evidence that fox predation was the driving factor behind many of those population collapses.4Wildlife Biology. Impact of exotic generalist predators on the native fauna of Australia Australian possums fall squarely within the size range most affected by fox predation, and possum species in areas with dense fox populations have suffered accordingly.
Feral cats compound the problem. They are widespread across Australia and are efficient nocturnal hunters that overlap precisely with possum activity patterns. While cats tend to target smaller prey, young possums and smaller species like sugar gliders and pygmy possums are highly vulnerable. The combined pressure of foxes and feral cats on Australian native fauna has driven some of the most intensive predator control programs anywhere in the world, including large-scale fox baiting and feral cat trapping in national parks.
Possums as the Invader
New Zealand flips the script entirely. There, the common brushtail possum was introduced from Australia in the 1800s for the fur trade, and without any significant native mammalian predators to keep them in check, possum populations exploded. They now number in the tens of millions and cause enormous damage to native forests and bird populations, and they also serve as the primary wildlife vector for bovine tuberculosis. New Zealand conducts pest control operations across roughly 10 million hectares to suppress possum numbers, using aerial delivery of the toxin 1080 on a five-year rotation in remote forested areas and ground-based trapping and poisoning annually in more accessible terrain.5Wildlife Research. A review of biodiversity outcomes from possum-focused pest control in New Zealand In this context, possums have essentially no natural predators, and human intervention is the only meaningful population control.
The New Zealand situation illustrates how critical natural predators are to possum population dynamics. When those predators are absent, possum populations grow unchecked and become ecologically destructive. It is also a case where the same species, the brushtail possum, is a protected native animal in one country and a heavily controlled pest in another.
Playing Dead and How It Actually Works
The Virginia opossum’s most famous defense is thanatosis, commonly called “playing possum.” When severely threatened, an opossum collapses, becomes limp, and may drool, with its mouth open and its eyes either closed or staring blankly. The tongue sometimes lolls out. The opossum may also release a foul-smelling fluid from its anal glands, making itself seem as unappealing as possible to a predator looking for a fresh meal.
What is less widely appreciated is that this is not a conscious decision. Thanatosis appears to be an involuntary physiological response triggered by extreme stress. During the episode, the opossum’s heart rate drops by about 46%, its breathing rate decreases by roughly 31%, and its body temperature falls slightly.6Current Biology. Thanatosis The animal is essentially in a temporary catatonic state. It can last anywhere from a few minutes to several hours, and the opossum has limited control over when it ends. This makes thanatosis a genuinely risky strategy: if the predator is not deterred and continues its attack, the opossum cannot snap out of it and run. But for predators that lose interest in prey that does not move or that smells like it is already decaying, the act works remarkably well.
It is worth noting that not every threatening encounter triggers thanatosis. Young opossums, for instance, are more likely to hiss, bare their teeth, and bluff aggressiveness. Thanatosis seems to be a last resort deployed when other deterrents fail, and individual opossums vary in how readily they enter the state.
Shelter, Timing, and Quiet Evasion
Beyond the dramatic spectacle of playing dead, possums across many species rely on more mundane but highly effective defenses: choosing the right place to sleep and the right time to forage. Den selection is a critical anti-predator behavior for arboreal possums. Studies across multiple species have found that possums strongly prefer tree hollows that are higher off the ground and in larger trees, a pattern generally interpreted as reducing predation risk while also providing better insulation.7Animal Conservation. Microclimate of daytime den sites in a tropical possum: implications for the conservation of tropical arboreal marsupials Common brushtail possums in reintroduction studies have shown a strong preference for natural tree hollows in eucalyptus species, ignoring artificial nest boxes entirely.8Austral Ecology. Can reintroductions to degraded habitat succeed? A test using the common brushtail possum The hollow itself acts as a physical barrier against climbing predators and aerial attack.
Timing matters just as much. Virginia opossums are strictly nocturnal, and as mentioned earlier, they adjust their activity windows in response to predator abundance. Some South American opossum species show an intriguing wrinkle in this pattern. The white-eared opossum in northern Argentina was found to be more active during brighter, moonlit nights, contrary to what you might expect if the goal were to avoid being seen by predators.9Mammalian Biology. Relationship between moonlight and nightly activity patterns of the ocelot (Leopardus pardalis) and some of its prey species in Formosa, Northern Argentina One possible explanation is that the primary predator in that system, the ocelot, reduces its own hunting activity on bright nights, giving prey species a safer window despite the greater visibility. The interaction between predator behavior and prey behavior creates a more complicated picture than the simple “darkness equals safety” model.
Why Juveniles Are So Vulnerable
Most possum mortality happens early in life. For Virginia opossums, the period between weaning and dispersal is particularly lethal. A study in southeastern New York found that only about 22% of juvenile opossums survived from weaning through the period before they dispersed from their natal area, with most deaths occurring after weaning rather than during the pouch phase.10Journal of Mammalogy. Maternal Denning Behavior and Survival of Juveniles in Opossums in Southeastern New York Newly independent juveniles are small, inexperienced, and lack the behavioral repertoire of adults. They are easier targets for everything from house cats to hawks.
Australian possum species face a similar bottleneck. Juvenile brushtail and ringtail possums that have recently left their mother are especially vulnerable to predation by foxes, feral cats, and powerful owls. Because these young animals are still learning to navigate the canopy and have not yet established reliable den sites, they spend more time exposed. This juvenile mortality is a major factor in population dynamics and helps explain why possum populations can crash quickly when predator numbers spike, even if adult survival remains relatively stable.
What Happens When Predators Disappear
One of the more revealing windows into possum-predator relationships comes from island populations. When marsupials have been isolated on predator-free islands for many generations, they tend to lose their anti-predator behaviors in measurable ways. A comparative study of macropodid marsupials found that island populations showed a systematic loss of group-size vigilance effects. Mainland animals foraged less and stayed more watchful, especially in smaller groups. Island animals, by contrast, foraged more and were less vigilant regardless of group size.11PubMed. The loss of anti-predator behaviour following isolation on islands While this particular study focused on macropods like wallabies, the principle applies broadly to island marsupials, including possums. Populations that evolve without predation pressure become naive, and when a predator is subsequently introduced, whether by human activity or natural colonization, the results can be catastrophic.
This pattern helps explain why invasive predators have been so devastating in Australia and New Zealand. Many native marsupials simply had no evolutionary preparation for animals like the red fox, which is a fast, intelligent, and adaptable predator originating from a continent where prey species co-evolved with it over millions of years. Australian possums evolved alongside dingoes and large raptors, but foxes and feral cats hunt differently and more persistently than anything in the native predator suite. The mismatch between predator capability and prey defenses has been a recurring theme in Australian conservation biology for over a century.
Domestic Dogs and Opportunistic Killers
Outside the tidy categories of wild predators, domestic dogs kill a substantial number of possums in both suburban and rural settings. Dogs that are allowed to roam at night frequently catch and kill opossums in North America, and in Australia, roaming dogs are a recognized threat to brushtail possums in peri-urban areas. Unlike wild predators, dogs often kill without eating the prey, so the deaths do not register in dietary studies but can still have local population effects.
Other opportunistic predators round out the list. Raccoons, while not typically thought of as possum predators, will kill juvenile opossums. Large fish, including alligator gar and largemouth bass, have been documented taking juvenile opossums at the water’s edge in the southeastern United States. American alligators will take opossums of any size when the opportunity arises. In Australia, large monitor lizards, particularly the lace monitor, are skilled climbers that raid possum dens for both adults and young. Even ravens and crows will mob and kill juvenile possums if they find them exposed during the day.
The breadth of the predator list underscores why possums are among the most preyed-upon mammals in many of the ecosystems they inhabit. Their ecological role as abundant, mid-sized, relatively slow prey makes them a dietary staple for a wide variety of hunters. What keeps possums viable as species, despite this pressure, is a combination of high reproductive output, flexible habitat use, and a suite of behavioral and physiological defenses that, while imperfect against any single predator, are collectively effective enough to maintain populations across an enormous geographic range.