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Looking after your eggs is an even greater challenge for reptiles...
對離開陸地，以海洋為家的爬蟲類來說
that have left land to live in the sea.
守護蛋的難度更高
The Pacific island of Niue is home to the world's entire population...
太平洋的紐威島，有一種
of one particular type of sea krait.
僅見于此地的海蛇
This snake is superbly adapted to life underwater...
這種蛇非常適合海中的生活
except when it's time to breed.
唯一的例外是繁殖的時候
After a few minutes in a mating coil, the female is fertilised.
在緊緊交纏幾分鐘后 母蛇受精了
But now she has a problem.
但這下出現了一個問題
Reptile eggs can't survive underwater,
爬蟲類的卵在水中無法存活
the developing young would drown. They have to be able to breathe air.
發育中的小蛇會被活活淹死 它們必須要能呼吸到空氣
She and her eggs are both vulnerable to predators, if they return to land.
如果回到陸地上，母蛇和它的卵 都很可能會被吃掉
But she has an extraordinary solution.
但母蛇有個了不起的妙計
She dives beneath the island,
它潛到島嶼下方
to find the entrance to a long underwater tunnel.
尋找一座海底山洞的洞口
