but they are in fact completely unique. 但它们其实独一无二
sharks are one of the most successful dynasties in history. 鲨鱼王朝 一直是史上最成功的王朝之一
these fish are balled together for protection. 这些鱼聚集在一起以寻求保护
they are as close to perfection as an ocean predator can get. 是近乎完美的海洋捕食者
Today, there are more than 30,000 species of fish. 今天存在超过三万种鱼
the juvenile's jaws are not yet strong enough to break its shell. 幼鱼的颌尚不够强大 无法咬破它的壳
Even its young, barely half its size, are fearsome predators. 即便在幼年期 仅有一半大小 也是可怕的捕食者
they are rarely the top predators their towering ancestors once were... 它们却极少像高大的祖先那般 成为顶级捕食者