It's the world's largest burrowing animal.

土豚是世界上体形最大的穴居动物。

Other burrowing animals, like anteaters, have similar adaptations.

其他穴居动物，如食蚁兽，也有类似的适应。

As burrowing animals evolved, the ocean bottom was becoming a lot softer.

随着穴居动物的进化，海底变得更加柔软。

Another option was that small, burrowing animals were helping to move oxygen directly to the sulfide, except, the researchers had removed all of those before starting their experiment.

另一个选择是，挖洞的小动物可以帮助将氧气直接移动到硫化物中，不过研究人员在开始实验之前已将所有氧气都去除了。

The sun was up, but it was yet too cold for the birds and the few burrowing animals that dwell here.

太阳升起来了， 但对于栖息在这里的鸟类和少数穴居动物来说还是太冷了。