英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—1

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Spy cameras are capturing the most intimate images ever taken of polar bears. They're revealing some remarkable¹ behavior and discovering an animal of surprising curiosity and intelligence.

 

Snow-cam doesn't operate alone. Blizzard-cam can travel at 40 mph, powered by propellers² and gliding³ on skis. Snowballcam can operate at temperatures of 40 below. Its spherical⁴ design makes it almost indestructible. Together they explore the islands looking for bears. Their first mission is to film a mother with cubs⁵ emerging from maternity⁶ dens⁷ hidden in these hills. The only clue to the den's presence is a snowy mound⁸. Driftcam and other spycams can lay in wait for days. They are left unattended, primed to film the moment they sense movement. A whiteout soon makes their task seem like mission impossible. But help is a paw swipe away.

 

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