英语听力:自然百科 北极熊 冰上间谍 Spy_Bear—14(在线收听

 This is a high-risk strategy. Like the male at the whale carcass, some bears don't do sharing. She stands up to make herself look bigger. The cub copies. Luckily, this bear has no appetite for a fight. 

 
There is a feeding etiquette 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 deploys backup. Snowballcam's arrival fascinates the curious bears, particularly as the steep slope gives it momentum. He tries some fancy footwork, more bears join the team
  原文地址:http://www.tingroom.com/lesson/zrbaike/2010/259542.html