Question

It builds up fat reserves during autumn by feeding on berries. It digs a den, lines it with grass
and then goes into dormancy.
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Answer 1

Answer:

Groundhogs are also called woodchucks. They eat nearly a pound of food per day in fall to help build up fat stores, and dig a deep den that they line with grass or twigs to make it comfortable for hibernation. ... They then crawl down into their deep burrows to hibernate.

Answer 2

Answer:

European hedgehog

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