As they approach, waves of excitement ripple through the huddle. 随着它们脚步的临近, 雄企鹅们开始表现出抑制不住的兴奋
when bears are on the verge of starvation, will they risk attacking such dangerous prey. 才会攻击这样危险的对象
The walruses sense that they are in danger. 海象已经意识到危险
They weigh over a ton and are armed with tusks a metre long. 体重超过1吨, 有长达1米的象牙为武器
but with this platform now gone, they need a new place to haul out and nurse their young. 但这块平台已经消失,它们需要新的地方哺育幼仔
They use scree slopes to protect their eggs, 它们利用岩肖山坡保护鸟蛋
They seek bare rock on which to lay their eggs and they look rather like penguins, too. 它们寻找裸岩 好在上面产蛋, 它们长得也有几分像企鹅
Without its solid platform, they can't hunt the seals they need in order to survive. 没有坚实的冰作为平台, 北极熊就不能猎捕它们赖以生存的海豹