None, because koalas do not eat "everything". Koalas feed almost exclusively on gum (eucalyptus) leaves and flowers. No other animal can eat the gum leaves.
Humans eat mostly herbivorous animals (animals that eat plants). But there are and many omnivores that are used for food, including chickens and turkeys. And several carnivorous fish are regularly...
Humans eat mostly herbivorous animals (animals that eat plants). But there areand many omnivores that are used for food, including chickens and turkeys. And several carnivorous fish are regularly...