In the darkness they can tell the difference between a beluga and a narwhal by the sound of their breathing .
即使在黑暗中,他们也能根据呼吸声判断出白鲸和独角鲸的区别。
A beluga whale puts on a bubble-blowing show for spectators at an aquarium in tokyo ......
一头白鲸在东京水族馆里向观众表演吐泡泡。
The sunday before I left greenland ( laidre would stay for several more weeks ) , the stranded beluga hunters chugged back to niaqornat in their boat .
But it 's exactly what is required for polar bears , ring seals , and the snowy-white beluga whales -- the highly vocal canaries of the sea .
而那正是北极熊、环纹海豹和海洋高音金丝雀--雪白的白鲸所需求的。
In recent decades there has also been a rise in levels of mercury , a by-product of burning coal , in the tissues of beluga whales , walruses and polar bears , all of which the inuit eat .