Sir David Attenborough explained:
Their natural home is out on the sea ice, but the ice has retreated away to the north and this is the closest place to their feeding grounds.
But walruses’ eyesight out of the water is poor, but they can sense the others down below, as they get hungry they need to return to the sea. In their desperation to do so, hundreds fall from heights they should never have scaled.
Producer Sophie Lanfear said:
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