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den


[DEN]

A den is a home for an animal such as a bear. Dens can be in caves or under fallen trees.

  den

cave


[kayv]

A cave is a large hole underground, or in the side of a hill or cliff.

  cave

hibernation


[hy-bur-NAY-shun]

When animals go into hibernation, they spend the winter in a deep sleep.

hibernation

freeze


[FREEZ]

When something freezes, it gets so cold that it turns to a solid. When water freezes, it turns to ice.

  freeze

thaw


[thaw]

When something thaws, it melts. It warms up, so that it is no longer frozen.

  thaw
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