making them perfectly adapted to hunting in burrows 使它们完全适应了在洞穴中捕猎
yet just like in today's forests... 但就像今天的森林中一样
thought to number only 3,000 in the wild. 据估在野外只有3000只
Today, in the forests of Southwest Australia, 如今在澳大利亚西南部的森林中
these small creatures were limited to a life in the margins. 这些小生物局限在边缘生活
Combined with the surge in plant life, 再加上植物的激增
using antibiotics carried in their saliva to help them heal. 使用其中含有的抗生素 来帮助它们痊愈
The casualties in this age-old battle rapidly mount up. 这场古老战斗的伤亡迅速增加
in a remarkable evolutionary arms race. 这是一场精彩的进化军备竞赛