Caribou and moose move to the boreal forest, sheltering among the trees, eating twigs and scratching for browse under the snow. Voles and lemmings live in chambers tunneled through the snow, spending their winters active and in relative warmth, eating food cached in summer. Some animals fatten up before winter and do not have to eat. Ground squirrels go fully into hibernation, while black and grizzly bears spend many months in a lighter, sleeplike dormancy inside their dens. Some fish become inactive after retreating to deep still waters under the ice of rivers and lakes. Beavers keep snug within their lodges and live mostly on stored food.
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