英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—14

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There is a feeding etiquette² around a seal carcass. Bears that approach correctly are often allowed to share, particularly if they are known. They greet.  Away from the carcass, young males often become friends, hanging out together. As ever, our spycams prove a huge hit with the curious bears. With the driftcams out of action, blizzardcam returns to frontline duties, and deploys³ backup. Snowballcam's arrival fascinates the curious bears, particularly as the steep slope gives it momentum⁴. He tries some fancy footwork, more bears join the team

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