The Possum Problem, by Johanna Knox

"Possums. You hardly ever see them, but they’re all around: in the bush, on farms, in parks. They might even be in your garden. During the day, possums stay in their dens. These are dry, hidden places where they won’t be disturbed. Possums emerge after dark, millions upon millions of them, all across New Zealand. And what do they do? They eat."