Possible Clues:

• Anthropophagic, it's a wild and wicked beast
• Unusually deviant animal's a kind of marsupial
• Cunning mantis and a hideous beast that's predatory
• Marsupial primarily found in island, a native running wild
• Creature for which exotic island vet harbours passion?
• Deviant animals on the rampage? This beast is certainly wild
• Ferocious animal invades Malta in spring
• Small ferocious carnivorous marsupial
• Down under, one runs wild, pocketing litter