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Looking after your eggs is an even greater challenge for reptiles...
对离开陆地，以海洋为家的爬虫类来说
that have left land to live in the sea.
守护蛋的难度更高
The Pacific island of Niue is home to the world's entire population...
太平洋的纽威岛，有一种
of one particular type of sea krait.
仅见于此地的海蛇
This snake is superbly adapted to life underwater...
这种蛇非常适合海中的生活
except when it's time to breed.
唯一的例外是繁殖的时候
After a few minutes in a mating coil, the female is fertilised.
在紧紧交缠几分钟后 母蛇受精了
But now she has a problem.
但这下出现了一个问题
Reptile eggs can't survive underwater,
爬虫类的卵在水中无法存活
the developing young would drown. They have to be able to breathe air.
发育中的小蛇会被活活淹死 它们必须要能呼吸到空气
She and her eggs are both vulnerable to predators, if they return to land.
如果回到陆地上，母蛇和它的卵 都很可能会被吃掉
But she has an extraordinary solution.
但母蛇有个了不起的妙计
She dives beneath the island,
它潜到岛屿下方
to find the entrance to a long underwater tunnel.
寻找一座海底山洞的洞口
