英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—11

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Bears have only recently discovered this new source of food, seeking out colonies that nest on the ground rather than on cliffs. The eggs are a rich source of protein. Just 250 are as nutritious² as one ringed seal. She carefully picks up an egg in her jaws³ before swallowing its contents. The geese launch an attack. 

 

Some have goslings, a bite-size snack for a bear. In just one day, one bear can devour⁴ over 1,000 eggs and hatchlings, destroying a whole colony. But as the threat escalates⁵, so does the defense⁶.

 

Arctic skuas join the attack. A skua lands a direct hit. She's had enough.

 

In future, the birds will have to start nesting on cliffs to avoid polar bear attacks.

 

Skuas may have saved the colony this time, but they've made the bears' lives a lot more difficult. 

 

Further north from Svalbard, other landlocked bears have found a more reliable meal, a carcass of a stranded⁷ fin⁸ whale. Icebergcam investigates the happy gathering⁹. The whale is 24 meters long and weighs 60 tons, an once-in-a-lifetime feeding opportunity. An adolescent eats confidently alongside four adult bears.

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