- they have all not only lost the pigment in their skin,
它们不仅失去了皮肤色素
- but also their eyes.
眼睛也退化了
- 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
- so these species must have been isolated for a very long time.
所以这些物种必定 与世隔绝了相当长的一段时间
- But the blind salamander has other highly developed sensory organs.
不过这些瞎眼的蝾螈 进化出了其它发达的感觉器官
- Receptors in their skin detect minute movements in the water made by its prey.
皮肤上的探测器能觉察到 猎物引起的最微小的水流变化
- 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
来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 260 行