But just how good is eagle vision?

但是老鷹的視力到底有多好呢？

To put it to the test, Lloyd Buck and his Golden eagle Tilly are entering a remote part of Scotland.

為了進行測試，Lloyd Buck 和他的金雕 Tilly 正在進入蘇格蘭的偏遠地區。

They're joined by Professor Graham Martin, an expert in avian vision.

他們還邀請了專門研究鳥類視覺的 Graham Martin 教授一同前往。

I'm intrigued to learn more about just how good her eye sight is.

我很好奇想更深入瞭解她的視力到底有多好。

Ok. Well, I think we can set something up, sort of game of hide and seek, perhaps.

我想我們可以安排一些測試，也許是玩捉迷藏之類的。

Tilly must find Lloyd somewhere in this landscape.

Tilly 必須在這片景色中找到 Lloyd。

Her cage has been covered so she can't cheat.

她的籠子已被蓋住，以免作弊。

Lloyd has found a position 2.5 kilometers away on the other side of the Glen, and weather conditions are not ideal.

Lloyd 找到了一個距離 2.5 公里，位於峽谷另一側的位置，而當時的天氣狀況不是很理想。

Even with a powerful telephoto lens, it's hard to pick out Graham and Tilly.

即使使用了強大的望遠鏡頭，也很難辨認出 Graham 和 Tilly 的位置。

It's a long way.

距離很遠。

I cannot see you without a pair of binoculars and even with the binoculars, there's that much moisture in the air.

我沒有雙筒望遠鏡看不到你，但即使有雙筒望遠鏡，空中也很霧。

So let's see what she does, now. This is the big test.

我們來看看牠的表現。這是關鍵的測試。

Ok, then. Well, I'll release her now. Ok?

我要釋放她了，可以嗎？

Ok. Good luck.

可以。祝好運。

Come on, Tilly. Come on, Tills.

來吧，Tilly，加油，Tills。

She's off.

她出發了。

She's looking very hard.

她很認真在看。

I'm sure she's trying to find you.

我很確定她在試著找到你。

Tilly has never faced a challenge like this, but she appears to spot Lloyd almost immediately and makes her way to the other side of the Glen.

Tilly 從未面對過這樣的挑戰，但她似乎立刻就發現了 Lloyd，然後開始向山谷的另一邊前進。

Come on, Tilly. Come on.

來吧，Tilly。

Interestingly, she takes an indirect route, riding a series of strong air currents to reach Lloyd more efficiently and more quickly.

有趣的是，她採取了迂迴的路線，利用一系列強大的氣流更有效率和更快地到達了 Lloyd 的位置。

She's coming in. She's coming in fast.

她要降落了。她速度很快。

She's done it. Graham.

她做到了，Graham。

Absolutely. Hammering across the valley.

當然，她疾速穿越山谷。

Oh, what a bird she is.

她真是一隻很棒的鳥。

You clever bird.

你真是聰明的鳥。

What an eagle you are. Hey, hello.

你真是隻很棒的老鷹。

Graham, she's on my arm.

Graham，她在我的手臂上了。

That is absolutely incredible. I'm so pleased with that.

太不可思議了，我非常高興。

I've never asked her to find me like that.

我從未要她這樣找過我。

That is actually very, very impressive because it took really very little time at all.

這真的非常非常令人佩服，因為她只用了非常短的時間。

Tilly spotted Lloyd in this vast landscape from 2.5 kilometers away.

Tilly從 2.5 公里外的這片廣闊風景中發現了 Lloyd。

A feat so impressive, it seems almost superpowered.

這是一個非常令人佩服的成就，幾乎像是超能力。

So how does she achieve this?

她是如何達成的呢？

Images are projected onto the retina at the back of the eagle's eye.

影像是被投射在老鷹眼睛後方的視網膜上的。

This area is covered with light sensitive cells known as cones.

這個區域被稱為視錐細胞的感光細胞所覆蓋。

The more cones, the sharper the eyesight.

視錐細胞越多，視力越敏銳。

A human eye may have 200,000 cones per square millimeter, but eagles have over twice as many giving them the sharpest eyesight of any vertebrate animal.

人類的眼睛每平方毫米可能有 20 萬個視錐細胞，但鷹的視錐細胞數量是人類的兩倍以上，這讓它們擁有所有脊椎動物中最銳利的視力。

The eagles' supreme visual acuity gives them a significant advantage.

老鷹超凡的視覺敏銳度為牠們帶來了顯著的優勢。

It means they can quickly pick out prey in a vast landscape.

這意味著牠們可以在廣闊的地形中快速辨識出獵物。

But there's an unexpected downside to having such sharp vision.

但是擁有如此敏銳的視力也有一個意想不到的缺點。

The problem is you don't want to get the sun in your eyes.

問題就是，牠們不希望太陽照進眼睛裡。

It would destroy all the very high acuity it's got.

這會破壞其高解析度的視力。

So they have these big eyebrows.

所以牠們眉毛很大片。

It's like wearing a baseball cap. That's all designed to keep the sun out of their eyes, so they don't actually ever image the sun.

好比戴著能遮蔽陽光的棒球帽，保持眼睛遠離陽光，讓牠們不會直視太陽。

This brow ridge is what gives eagles their fearsome stare.

這條眉脊讓老鷹擁有可怕的目光。

But it has a serious drawback.

但這有個嚴重的缺點。

Because if you've got to keep in the sun in your eyes, you can't actually see what's up there.

因為如果必須保持陽光遠離眼睛，其實是無法看到上方物體的。

What an eagle wants to do is patrol and look down at the big terrain below it and it's bending its head forward, it's tipping its head down to have a look.

老鷹會巡視並往下看大片地形，它會把頭向前彎曲，傾斜頭部往下觀察。

And that means that this blind area which is designed to keep the sun out of their eyes is stopping them actually looking where they're going.

這表示這個眉脊的設計目的是為了防止陽光照進牠們的眼睛，但卻阻礙了牠們往前方觀看的視野。

This blind spot isn't usually a problem.

這個盲區通常不會造成問題。

In their natural habitat, they soar high above the trees.

在牠們的自然棲息地中，牠們高高翱翔在樹木上方。

But in a modern landscape, it can be a fatal flaw.

但在現代的景觀中，這可能成為致命的缺陷。

Across the world, eagles are colliding with manmade structures.

在世界各地，老鷹撞上人造的建築物。

Wind turbines often built in wild landscapes can be a particular issue.

常建造在野外的風力發電機尤其是問題。

So at this wind farm in Wyoming, they've placed observation towers around the site, and if an eagle is spotted, they switch the turbines off.

因此在懷俄明州的這個風力發電廠，他們在場地周圍設置了觀測塔， 如果發現一隻鷹，他們就會關閉發電機。

But in bright light, eagles can be hard to spot.

但在明亮的光線下，很難發現老鷹的蹤影。

So now they're using artificial intelligence to improve the odds.

所以現在他們正在使用 AI 科技來提高發現的機率。

This technology harnesses ten cameras to spot and track flying objects.

這項科技利用十個攝像頭來發現和跟踪飛行物體。

They can work out if the object is an eagle in just one second and temporarily shut down any turbines in its path.

它們可以在一秒鐘內判斷出該物體是否是一隻老鷹，並暫時關閉其路徑上的所有發電機。