10.Bats

　　Bats avoid obstacles and nab insects on the wing by emitting ultrasonic squeaks and interpreting the echo the sound waves make after bouncing off objects in the environment. This biological sonar, called "echolocation," is also used by dolphins to navigate murky waters.

　　蝙蝠

　　蝙蝠在飞行中能敏捷躲避障碍物以及迅速捕捉到各种昆虫，依靠的是它们发出的超声波尖叫声，这些超声波在遇到物体反弹回来时蝙蝠就能确定自己的飞行和捕食路线了。生物学家称这种生物声纳为“超声波定位能力”，海豚也运用这种能力在黑暗的海水中为自己导航。

嗯，在DISCOVERY频道看过...