Opossums are omnivores, so they eat many different plants and animals, including carcasses of animals that have been killed by a car or abandoned by other predators. Their diet often consists of herbs, nuts, fruits, seeds, and grains. They prey on snakes, rodents, snails, frogs, insects, birds, worms, and slugs. In addition, possums are scavengers because they like to rummage through garbage bins or containers in search of leftover food.