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旁白：来听生物课讲座的部分内容。

Narrator: Listen to part of a lecture in a Biology class.

Professor: Today I want to talk about seabirds.

Now seabirds hunt and eat fish and, well,

它们的食物很难找到，因为它们的食物来源分散在大片的水域中。

their food can be hard to find because their food source is spread out over a large expanse of water.

因此，海鸟所做的是随着时间的推移，它们做出了适应，

So what seabirds have done is that over time they've made adaptations,

它们已经发展出特殊的特征来帮助它们找到食物。

they've developed special characteristics that help them find food.

One adaptation involves the length of the birds' wings.

是一种大型海鸟，它一生的大部分时间都是在海洋水域上空搜寻食物，

is a large seabird that spends most of its life flying over ocean waters in search of food,

比如可以自己养活自己而捕鱼，也可以把它们带回巢里去喂鸟崽。

fish to feed itself and to carry back to the nest for its chicks.

大多数鸟类在飞行的时候会上下摆动它们的翅膀，这消耗大量的能量。

Now most birds flap their wings up and down when they fly, which uses up a lot of energy.

但是，信天翁沉重的长翅膀却能完美地使它保持不动。

But the albatross has these special long wings that it can hold perfectly still.

它能够在不上下移动它翅膀的情况下飞行。

It's able to fly without moving its wings up and down.

这些长翅膀使它能够滑翔或漂浮在风中，而这消耗的能量非常少。

These long wings allow it to glide or float on the wind, and this uses very little energy.

这很重要，因为，就像我说的，

信天翁要从一片广阔的海洋来寻找食物，

the albatross has to cover a huge expanse of ocean to locate food,

因为它的长翅膀可以在海洋中滑翔，在寻找食物的过程中消耗很少的能量。

because of its long wings that can glide along over the ocean using little energy as it searches for food.

对许多海鸟来说，另一个重要的适应是一种敏锐的、高度发达的嗅觉。

Another important adaptation of many seabirds is an acute, highly-developed sense of smell.

暴风鹱需要找到散落在海洋上的食物。

the fulmar needs to find food that scattered far out over the ocean.

但是暴风鹱有一个相当不寻常的优势，

But the fulmar has a rather unusual advantage,

it has tiny tubes inside the nose holes in its beak.

这些特殊的管状鼻孔可以帮助它闻到食物的气味。

And these special tube-shaped nostrils help it to pick up the scent of food.

这种高度发达的嗅觉尤为重要，

Now this highly-developed sense of smell is especially important,

因为暴风鹱的主要食物来源，浮游生物，是很难看到的微小生物，

because the fulmar's main source of food, plankton, are tiny organisms that are hard to see,

但它们散发出一种非常尖锐、独特的气味。

but they give off a very sharp, distinctive odor.

所以当暴风鹱四处寻找食物时，它们可能看不到浮游生物，

So when fulmars are flying around looking for food, they may not be able to see them,

但是它们可以通过嗅闻这些浮游生物来找到它们，甚至从很远的地方。

but they can find the plankton by smelling them, even from far away.

<img src="/upload/ti/2427000-2428000/2427105/6138060e8c16474786b85aa16edc6792.jpg">
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 Using the examples of the albatross and the fulmar, explain two special adaptations that have developed to help seabirds find food.
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