宽吻海豚
A bottlenose dolphin plays in a lagoon in Waimanalo, Hawaii. 一只宽吻海豚在夏威夷威玛纳诺的泻湖里嬉戏。
While sleeping, the bottlenose dolphin shuts down only half of its brain. 睡觉时，宽吻海豚仅让一半的大脑停止工作。
