Their lungs are collapsible, helping them to dive to these tremendous depths, and they find their prey by sending concentrated streams of sound out into the deep, dark waters.

• 牠们的肺脏能够收缩，有助牠们下潜到如此惊人的深度，牠们靠朝深邃幽暗的水中发出密集的音波来搜寻猎物。