山岳启示录:欧洲高山世界 Mountain Lessons | Europe's Heights | National Geographic UK-WILD

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After a long climb, they make it, and she can feed to replenish her supply of milk.

Giving the cubs the energy they need to grow.

But the perils of the mountain are not over.

With full bellies, they have to head down again to the safety of the forests.

A treacherous descent begins.

Suddenly, the cliff spells danger.

When one adventurous cub tumbles over the edge.

It's an anxious moment for the mother bear.

She desperately tries to spot her fallen youngster.

Many young cubs do not survive.

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