External gills help it to breathe in water that is particularly low in oxygen. 外生的鳃帮助它们 在极度缺氧的水中呼吸
It takes thousands of generations for eyes to be lost, 眼睛的退化需要经历数千代的演变
And the Belizean white crab is another creature that is unique to just one cave system. 而伯利兹白蟹是另一个 洞穴生态系统中的特有物种
seems to be restricted to just two small caves. 可能只存在于两个较小的洞穴中
and this gives them something to aim at. 这也给了它们瞄准目标的机会
To the snakes the bats are apparently glowing 每一只蝙蝠在蛇“眼”前都是活灵活现
The strikes seem to be largely hit-and-miss, 这种攻击更像是在碰运气
There are other fish working to a different schedule. 这里还有其它 按照不同日程表生活的鱼
vast shoals of demoiselle fish return to the caves, 大群雀鲷返回到洞窟中
all of which eventually flow out to the sea. 它们最终都流向大海