At one end are species like the mosquitofish that'll only move on land when forced.

一方面是食蚊鱼这样的物种，它们只有在被迫时才会在陆地上移动。

Other species, like mosquitofish, exercise their inner ear to determine where they're oriented on a slope, relying on the probability that they'll find water by moving downhill.

其他物种，如食蚊鱼，会利用内耳来确定它们在斜坡上的位置，这取决于它们下坡时找到水的可能性。