The moose is the world's largest deer.

驼是世界上最大科动物。

It's one of the tallest mammals in North America, and the largest of all deer species in the world: the moose.

它是北美最高哺乳动物之一，也是世界上体型最大科动物：驼。

And there is no cervine institute.

也没有科动物机构。

Why would cute little deer-things end up leading a whole order of mammals to life in the deep sea?

为什么科小动物会引导整个哺乳动物目进化到深海生活？

And there in the middle is the walking swimming whale, linking whales as we know them to tiny, cat-sized deer-things, just dipping their toes in the water for the first time.

而在中间就是步行游泳鲸，它将我们所熟知鲸目动物与那些小型、猫般大小科动物联系起来，这些科动物刚刚开始把脚趾浸入水中。