While possums are omnivores, meaning they eat both plants and animals, they are primarily herbivores. Their diet consists mainly of fruits, leaves, flowers, and nectar. They do sometimes eat insects, snails, and even small vertebrates like birds and lizards, but these are not staples in their diet.
The Australian Zoo likely conducted the experiment to show the versatility of the possum's digestive system. However, it doesn't mean that they regularly eat meat or that it's a significant part of their diet in the wild.
It's important to remember that just because an animal can eat something, doesn't mean it should or that it's a natural part of their diet.