Name: 【TED-Ed】足間出沒的蟬大軍 (Cicadas: The dormant army beneath your feet - Rose Eveleth)
Uploaded: 2013-11-13T03:52:03.000Z
Duration: 2 min 46 s

If you live on the east coast of the United States,

There are fifteen different broods of cicadas out there,

grouped by when they'll emerge from the ground.

Some of these broods are on a 13-year cycle,

不論何種形式，這些蟬大部分時間

the adults will begin to burrow their way

where they will live for just a few weeks.

everybody will know the cicadas have arrived.

In fact, if you happen to be using a chain saw

事實上，如果你恰巧用上了鏈鋸

the cicadas don't arrive without a posse.

There are all sort of awesome and gross predators and parasites

因為有各種可怕又噁心的 掠食者及寄生蟲

in the cicada's abdomen and eats the bug alive,

they burst out of the still-alive cicada,

turning the bug into a flying salt shaker of death,

讓蟬的下腹如鹽巴揮灑 斷裂開而死亡

when the cicadas will arrive and fade away,

to having your entire species emerge at once, of course.

The sheer number of cicadas coming out of the ground

that a few bugs will survive and reproduce.

And since cicadas emerge every 13 or 17 years,

longer than the lifespan of many of their predators,

壽命比起很多牠們的掠食者都要長

don't learn to depend on their availability.

It's possible the number just happened by chance,

這個數字很有可能只是碰巧發生了

or, perhaps, cicadas really love prime numbers.

Eventually, the cicadas will mate and slowly die off,

The eggs that they lay will begin the cycle again,

their cicada babies burrowing into the earth,

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【TED-Ed】足間出沒的蟬大軍 (Cicadas: The dormant army beneath your feet - Rose Eveleth)

plant

live

die

group