The Wild Before by Piers Torday

One stormy, snowy night, a pure silver calf is born on an ordinary muddy farm by the light of the moon. This is the legendary Mooncalf, whose arrival has been foretold since the dawn of time.

According to a dream passed down from animal to animal, if the calf dies, a great Terribleness will come - rising seas, a plague, skies raining down fire, the end of all things... and Little Hare vows to persuade all the animals to protect Mooncalf, whatever the cost.

But it's easier said than done, and soon Little Hare realises that he is the only one who can save the world...