This nurse shark is unusually active for the daytime.

只护士鲨在白天跃实属罕见。

And we're not talking about those friendly nurse sharks or whale sharks, these are great whites.

些鲨鱼可不是友好的铰口鲨或者鲸鲨，它们可是真正的大白鲨。

You'll see a lot of nurse sharks, zebra sharks, some reef sharks and sand tiger sharks.

我们可以看到很多护士鲨、马鲨、礁鲨及虎鲨。

Nurse sharks are slow-moving bottom-dwellers, and, for the most part, harmless to humans although they can grow up to 14 feet, more than 4 meters, in length.

护士鲨是行动迟缓的底栖类动物，大多数时候对人类都是无害的，即使它们体型可达14英尺或超过4米。

Usually a nurse shark will hide under ledges or in crevices of the reef, and come out at night to eat dormant fish that are hiding in the coral.

通常护士鲨会藏在礁檐下方或是缝隙中，并在夜间出来，去捕食藏在珊瑚中熟睡的鱼。

Nurse sharks even nap on the seafloor; however, they use a form of ram ventilation in which they draw in water through nostril-like structures near the eyes, called spiracles, and force it out through the gills.

铰口鲨甚至会在海底打盹；不过，它们采用的是一种特殊的撞击呼吸，即通过眼睛附近的鼻孔状结构（称为鳃裂）吸水，然后用鳃将水排出。