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If you liked the colorful animals we just saw, you\'re going to love these next animals: frogs.

如果你喜歡我們剛剛見到的色彩斑斕的動物，你們將會喜歡這些接下來的動物：蛙類。

You might not normally think of frogs as being colorful, but these frogs definitely are.

你們可能通常不認(rèn)為蛙類是色彩斑斕的，但是這些蛙類的確是的。

They are the dart-poison frogs of Central and South America.

它們是中部和南部美洲的箭毒蛙。

Look at their striking colors, often yellow with black stripes or deep blue with black spots.

看看它們醒目的顏色，通常是黃色帶著黑色條紋或者深藍(lán)色帶著黑點。

Beyond being nice to look at, these markings have a purpose.

除了好看之外，這些斑紋還有一個目的。

They warn predators that these frogs are poisonous.

它們警告捕食者這些蛙類是有毒的。

When threatened, these frogs secrete a substance through their skin that would easily kill whatever animal might try to eat them.

當(dāng)受到威脅時，這些蛙類通過它們的皮膚分泌一種物質(zhì)，可以輕易的殺死可能試圖要吃掉它們的任何動物。

Their bright colors communicate this, and so most animals tend not to hunt them.

它們明亮的顏色傳遞了這個(信息)，所以大部分動物不會去捕獵它們。

Now, speaking of hunting, for centuries these frogs were sought after by hunters.

好，說道捕獵，幾個世紀(jì)以來，這些蛙類受到獵人們的需要。

As you might think, the hunters didn\'t want to eat the frogs, but rather, they captured them for their poison.

正如你所想的，獵人不是想吃這些蛙類，而是，他們捕獲它們是為了它們的毒素。

They would add the poison to the tips of their hunting arrows.

他們會把毒素添加到他們打獵(用的)箭尖上。

Of course, nowadays most hunters use guns.

當(dāng)然，現(xiàn)在大部分獵人用槍。

These days, dart-poison frogs are of less interest to hunters than to medical researchers.

目前，獵人比研究者對箭毒蛙的興趣小。

Researchers believe that they can make new heart medicine from the poison, because it acts as a stimulant on the body\'s nervous system.

研究者相信他們能從毒素中制造新的心臟藥物。

Researchers think they could use it to stimulate a weak heart.

研究者認(rèn)為他們能使用它來刺激心臟衰竭。

There is, however, a problem with doing research on these frogs.

然而，在這些蛙類上做研究有一個問題。

Those that are caught in the wild will produce their poison until they die.

從自然環(huán)境中捕捉的那些(蛙)將產(chǎn)生毒素直至他們死去。

However, those that are born in captivity, like the ones you see here, will not produce any poison at all.

然而，那些出生在圈養(yǎng)(環(huán)境中的)，像你們看到的這些，將根本不會產(chǎn)生任何毒素。

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