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Though the swifts depend on the cave for shelter, they never stray further than the limits of daylight, as their eyes can't see in the dark.
盡管雨燕依靠洞穴遮蔽，他們卻必定在日落前歸巢，因為他們的眼睛無法在黑夜中看清事物。
However, deep inside the cavern, other creatures are better equipped for subterranean life.
然而洞穴深處是一群更適應地下隱秘生活的居民。
A colony of bats is just waking up, using ultrasonic squeaks to orientate themselves in the darkness. Night is the time to go hunting.
一群蝙蝠剛剛醒來，他們運用超聲波在黑夜中確定自己的方位。夜晚是狩獵時間。
