The vertical line marking each dive, on reaching its greatest depth, began to zigzag in the sawtooth pattern characteristic of blue whales when lunge feeding on krill.

 
  • 蓝鲸潜水时总是先直线向下,在到达最深处时,就开始以锯齿状路线行进,这是它们突进捕食磷虾时的行动特征。
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