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When their new armour has hardened,
当新壳变硬
the crabs return to the comparative safety of the deep,
蜘蛛蟹就回到较安全的海底
leaving behind only their old, empty shells.
只留下它们褪下的旧空壳
Like spider crabs, the behaviour of most marine creatures
跟蜘蛛蟹一样 多数海洋动物的行为
is controlled by a very simple nervous system.
都是由简单的神经系统控制
But there are exceptions.
但还是有例外
This cuttlefish is one of the cleverest animals in the ocean.
这只乌贼 是最聪明的海洋动物之一
She has a very large brain.
这只母乌贼有很大的脑部
In fact, it's larger for her size
根据身体比例
than that of most fish or reptiles.
它的脑部 比多数鱼类或爬虫类更大
Her life is both complex and full of intrigue.
它的生活不只复杂，更充满谜题
Giant Australian cuttlefish usually live alone,
澳洲巨乌贼通常独来独往
but once in their short lives they must come together to mate.
但在短暂的生命中 它们必须聚集一次进行交配
