While the story about a zoo experiment may be interesting, it is not entirely accurate to say possums regularly eat meat.
Possums are omnivores, meaning they can eat both plants and animals, but they are primarily herbivores. Their diet consists mainly of fruits, leaves, flowers, and nectar. They do occasionally eat insects, snails, and small vertebrates such as birds or lizards, but these items are not dietary staples.
A zoo might conduct an experiment to demonstrate the versatility of a possum's digestive system, but that does not mean meat is a normal or significant part of their wild diet.
It is important to remember that just because an animal can eat something does not mean it should, or that it is natural for them.