当抹香鲸需要小憩时,它们会深呼吸,潜入约45英尺深的水中,并将自己排列成完美的水平垂直模式。直到2008年的一项研究记录了鲸鱼的垂直睡眠行为,才有人知道鲸鱼是垂直睡眠的。直到2017年,才有人在野外拍摄到真正优秀的照片
When sperm whales need a nap, they take a deep breath, dive down about 45 feet and arrange themselves into perfectly-level, vertical patterns.No one knew whales slept vertically until a 2008 study documented the behavior. And no one captured really good photography of it in the wild until 2017