水栖动物获得池塘，陆栖动物获得某种笼子。

Aquatic animals get tanks, land animals get enclosures of some kind.

雌雄同体的陆栖和水栖环节动物，只在沿身体部位有鬃毛。

Hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body.

每当提起这种巨大的水栖哺乳动物，未知的总是比已知的多。

There is more unknown than known when it comes to this giant aquatic mammal.

杰斯：噢，有。我们有一些水栖蝮蛇在笼子里，另一个笼子还有响尾蛇。

Jeth: Oh yeah. Got us some cottonmouths in that cage and rattlers in the other one.

研究者在文中指出，虽然北极熊是海洋哺乳动物，它们从海洋中获取食物(如海豹)；可是它们不是水栖哺乳动物。

The researchers write that although polar bears are Marine mammals, in that they derive their nutrition from the ocean (i.e. they eat seals), they are not aquatic mammals.