All that remained of a bygone age. 它们是一个过去时代的仅存硕果
because there's something all amphibians need to raise their young. 因为所有两栖动物养育后代 都需要一样东西
Including the greatest runner of them all, 包括其中最出色的奔跑者
They now make up over 80% of all animal species. 节肢动物 如今已占据所有动物物种的80%以上
...so can focus all his energy on finding a mate. 所以可以把全部精力放在觅偶上