Possums are among the most misunderstood neighbors in both suburban and rural landscapes. Often glimpsed as a ghostly white face retreating into the shadows or a rustle near the trash bins, these marsupials—specifically the Virginia opossum in North America—have survived since the era of the dinosaurs. A primary reason for this evolutionary longevity is their incredibly flexible diet. As opportunistic omnivores, their motto for survival is simple: if it’s organic and accessible, it’s probably on the menu.

Understanding the specifics of what possums like to eat requires looking past the common image of a scavenger. While they certainly appreciate a free meal from a tipped-over garbage can, their natural dietary habits are complex, seasonally driven, and surprisingly beneficial to the ecosystems they inhabit.

The Biological Machinery of an Omnivore

To understand why possums eat what they do, one must first look at their mouth. The Virginia opossum boasts 50 teeth, the highest number of any land-dwelling mammal in North America. This dental arsenal includes sharp incisors for gripping, prominent canines for tearing, and specialized molars for crushing. This variety allows them to transition seamlessly between soft fruits, crunchy insects, and tough bone.

Their digestive system is equally adaptable. Possessing a relatively simple stomach but a highly efficient metabolic process, they can process proteins and fats from carrion just as effectively as sugars from fallen fruit. This biological versatility is what allows them to thrive in environments ranging from deep forests to high-density urban centers.

Invertebrates: The Protein Foundation

For a wild possum, insects and other invertebrates represent the most consistent and vital protein source. They are particularly fond of beetles, cockroaches, and grasshoppers. In garden settings, they act as a natural pest control service by consuming large quantities of snails and slugs, which are notorious for damaging ornamental plants and vegetable crops.

One of the most frequently cited benefits of having possums nearby is their consumption of ticks. Research suggests that a single possum can consume thousands of ticks during a single grooming season. Because they are fastidious groomers, they often find and eat ticks that attempt to latch onto them, effectively acting as an ecological "trap" for these disease-carrying arachnids. While they don't necessarily hunt ticks in the grass, their presence significantly reduces local tick populations through this passive consumption.

Small Vertebrates and the Resistance to Venom

Possums are surprisingly capable hunters of small vertebrates. Their diet often includes mice, rats, and even small birds or their eggs. This predation provides essential calcium and fat, especially during the breeding season when females have higher nutritional demands.

Perhaps the most fascinating aspect of the possum’s diet is its relationship with snakes. Possums have evolved a remarkable resistance to the venom of pit vipers, such as rattlesnakes and copperheads. This immunity allows them to hunt and eat venomous snakes that other predators would avoid. For a possum, a snake is simply a high-protein meal that most competitors are too afraid to touch. This unique trait places them in a specific niche as a stabilizer of local reptile populations.

The Role of Carrion: Nature's Cleanup Crew

Decaying animal matter, or carrion, is a staple of the possum diet. In the wild, they scavenge the remains of animals killed by other predators or by natural causes. In modern landscapes, this often translates to "roadkill."

While eating dead animals might seem repulsive, it serves a critical sanitary function. By consuming carcasses, possums help prevent the spread of diseases and reduce the population of flies and other scavengers that might carry pathogens. However, this preference for roadkill is also a primary cause of possum mortality, as they are often struck by vehicles while foraging on the asphalt at night.

Plant Matter and Seasonal Shifts

While animal protein is preferred, possums consume a significant amount of plant material, which varies according to the season. Their diet is a reflection of what the land provides at any given moment:

  • Spring and Summer: The focus is heavily on insects, worms, and the first succulent greens. This is when they are most active in gardens, looking for high-protein grubs to support the growth of their young (joeys).
  • Late Summer and Autumn: As fruits ripen, possums shift toward a more frugivorous diet. They are particularly fond of fallen apples, persimmons, grapes, and berries. They also consume grains and seeds, often venturing near bird feeders to scavenge what has fallen to the ground.
  • Winter: In colder climates, food becomes scarce. This is the period of highest stress for a possum, as they do not hibernate and do not store significant body fat. During these months, they rely more heavily on carrion, dormant insects, and human-provided food sources.

The Urban Diet: Trash and Pet Food

In suburban environments, the availability of human food fundamentally alters possum foraging behavior. They are highly attracted to the smell of calorie-dense items. Two of the most common urban food sources are:

  1. Pet Food: Dry cat and dog food are irresistible to possums because they are packed with fats and proteins. It is common for homeowners to find a possum calmly eating out of a bowl left on a porch. While this is an easy meal for the possum, it can lead to conflict with domestic pets and habituation to human presence.
  2. Garbage: Possums are expert foragers in trash cans. They are attracted to meat scraps, fruit peels, and even discarded bread. However, they are generally less destructive than raccoons; while a raccoon might tear open a bag and scatter it, a possum is more likely to nibble on what is easily accessible.

The Danger of Human "Treats" and Metabolic Bone Disease

While it may be tempting to feed a visiting possum, many human foods are actively dangerous to them. Possums have a very high requirement for calcium but a low tolerance for phosphorus. When they are fed a diet heavy in "junk" foods—such as crackers, bread, cat treats, or excessive amounts of muscle meat—their calcium-to-phosphorus ratio becomes imbalanced.

This imbalance leads to a condition known as Metabolic Bone Disease (MBD). In affected possums, the body begins to pull calcium from the bones to maintain blood levels, leading to brittle skeletons, tremors, paralysis, and eventually death. This is why well-intentioned people who feed possums table scraps often inadvertently cause them severe suffering. A possum that eats naturally (insects and whole small animals) gets the calcium it needs from the exoskeletons and bones of its prey.

What to Do if You Want to Help

If you have a possum in your yard and want to support it without causing harm, the best approach is passive support. Rather than providing a bowl of processed food, you can create a habitat that encourages their natural diet:

  • Maintain a Garden: Avoiding pesticides allows the insect and slug populations to thrive, providing the possum with its primary natural food source.
  • Leaf Litter: Leaving a layer of leaves in corners of the yard provides a habitat for worms and beetles, which are high-quality possum snacks.
  • Native Fruit Trees: Planting native berry bushes or fruit-bearing trees provides a seasonal caloric boost that is far healthier than any processed snack.
  • Water Access: In dry weather, a shallow dish of clean water is often more valuable to a possum than food.

If you must provide supplemental food, small amounts of chopped vegetables (like kale or broccoli) or very small portions of low-phosphorus fruits are safer than pet food. However, the general consensus among wildlife experts is that a wild possum is most healthy when it is left to forage for its own diverse, high-calcium diet.

Australian Possums: A Different Flavor

It is worth noting that if you are in Australia, the "possum" you see (such as the Common Brushtail or the Ringtail) has a different dietary profile than the North American opossum. Australian possums are primarily folivorous and frugivorous. They love eucalyptus leaves, flowers, and nectar, though they will occasionally eat insects or bird eggs. In urban Australian settings, they are notorious for raiding rose gardens and fruit trees, showing a particular fondness for new growth and sweet blossoms.

Summary of Favorite Foods

To recap, if we were to rank a possum’s favorite items based on what they actively seek out, the list would look like this:

  1. Insects and Slugs: The "bread and butter" of their existence.
  2. Overripe Fruit: Nature's candy, especially in the fall.
  3. Small Rodents: Essential for calcium and fat.
  4. Venomous Snakes: A specialty dish they have little competition for.
  5. Cat Food: The "fast food" of the urban world (best avoided).

The Ecological Importance of the Possum's Appetite

Ultimately, what a possum eats makes them one of the most beneficial animals to have in your neighborhood. They are a biological filter, removing pests, cleaning up decaying matter, and checking the populations of rodents and snakes. By understanding that they are not just "trash cats" but sophisticated, opportunistic eaters with specific nutritional needs, we can better coexist with these ancient marsupials.

Rather than viewing them as scavengers to be driven away, we can see them as a sign of a healthy, functioning backyard ecosystem. Their diverse diet is a testament to their resilience and a reminder of the intricate connections between the wildlife in our gardens and the health of the environment as a whole.