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And the Belizean white crab is another creature that is unique to just one cave system.
而伯利茲白蟹是另一個洞穴生態系統中的特有物種
Living in perpetual darkness, they have all not only lost the pigment in their skin but also their eyes.
由于一直生活在黑暗之中，它們不僅失去了皮膚色素，眼睛也退化了。
It takes thousands of generations for eyes to be lost
眼睛的退化需要經歷數千代的演變
so these species must have been isolated for a very long time.
所以這些物種必定與世隔絕了相當長的一段時間
But the blind salamander has other highly-developed sensory organs.
不過這些瞎眼的蠑螈進化出了其它發達的感覺器官
Receptors in the skin detect minute movements in the water made by its prey.
皮膚上的探測器能覺察到獵物引起的最微小的水流變化
External gills help it to breathe in water that is particularly low in oxygen.
外生的鰓幫助它們在極度缺氧的水中呼吸
The cave angel fish feed on bacteria in the fast-flowing water,
洞穴天使魚以急流中的細菌為食
keeping their grip with microscopic hooks on their fins.
它們用鰭上的小鉤緊緊抓住巖壁
Food is often in short supply
食物總是很緊缺
and troglobites, like the crab, have to survive on whatever washes into the cave from outside.
像螃蟹這樣的穴居動物必須得吃任何從外邊沖進洞內的東西
A salamander might not encounter food for several months,
童態河溪螈可能已有幾個月沒有吃東西了
so when something does come along, it can't afford to miss it.
所以只要眼前有食物出現，它絕對不會放過。
