Roman Mars

But what about the longest fence?

Reporter Shirley Wong traveled deep into rural Australia to find it.

Dingoes are Australia's apex predator.

They are smaller than wolves, but can run just as fast.

They are lean and extremely athletic.

They have reddish blonde fur, white bellies, and pointy ears.

They look kind of like, I don't know, buff Shiba Inus.

It's called the Dingo Barrier Fence, and it stretches across the southeastern corner of the continent, separating dingoes from the part of the country where the vast majority of Australians actually live.

And it is the longest continuous fence in the world.

When you drive around Australia, fences are everywhere.

They're used to control the movement of a lot of different kinds of animals.

In fact, the dingo fence was originally built to manage a different creature altogether.

But that didn't turn out so well.

Because of Australia's island geography, the native plants and animals there evolved in relative isolation, which made them particularly vulnerable to invasive species.

And without a large number of natural predators, many of these new European creatures ran riot.

Rabbits came to Australia all because of one man, Thomas Austin, whose brother shipped him 24 rabbits from England as a gift.

Over the next three years, those 24 animals bred like, well, rabbits.

And soon there were thousands.

The rabbits damaged crops, overgrazed grasses, spread diseases, dug holes wherever they pleased.

Basically, they were the worst gift ever and made one man go down in Australian history as the guy who caused the rabbit plague.