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A narwhal's horn is actually an enlarged tooth and not a horn at all.
独角鲸的角实际上根本不是什么角，而是一颗巨大的牙齿
And today, we're talking about narwhals, unicorns of the sea.
今天我们要讨论的是独角鲸——海洋中的独角兽
Nice shirt. (Thanks.)
T恤不错。（谢谢）
My grandfather, Jacques Cousteau, studied and explored the Earth's ocean.
我的祖父，雅克·库斯托曾研究并探索过地球的海洋
I do too.
我也一样。
And our submarine is in arctic waters, searching for the narwhal.
我们的潜艇在北冰洋搜寻独角鲸
Oh, he's a beauty.
哇，他简直就是个美人儿。
Now, narwhals can grow up to 17 feet in length,
独角鲸身长可达17英尺
and their front tooth can grow up to 10 feet in length.
而他们的前牙可长达10英尺
It's the only straight tusk in the world.
它们有着全世界唯一的直牙
But typically, these are only found on males
然而，一般只有雄性独角鲸才有这种前牙
and are actually full of up to 10 million nerve endings,
其中布满了上千万条神经末梢
helping the narwhal detect pressure, salt levels and even temperature in the water.
可帮助独角鲸探测水中的压力、盐度甚至水温
Here's an interesting fact, a narwhal tusk is flexible.
有趣的是，独角鲸的这个前牙是可以活动的。
It can bend about one foot in any direction, without breaking.
它可以朝任何方向弯1英尺而不折断
It was originally thought that these tusks were for dueling.
人们原本以为这些长牙是用于竞争的
But a new theory suggests, they're for attracting a mate.
但有新的理论指出，它们是用来求偶的
Narwhals don't migrate like other whale species.
独角鲸不会像其他鲸类一样迁徙
They spend their entire lives in icy, arctic waters
它们终其一生都生活在冰天雪地的北冰洋
hunting squid, fish and crab.
以乌贼、鱼，蟹为食
If you want to see one live, you'll have to come up north
要想看活的独角鲸，你就得上北极
because narwhals don't thrive in captivity.
因为它们生存能力有限
Rather, they die.
它们宁愿死也不迁徙
Some animals, we humans just can't tame.
有些动物，我们人类就是驯化不了
