Understanding the human body is a team effort. That's where the Yachtel group comes in.

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When it comes to a guide for your gut, count on YacL.

This is Scientific American's 60-second science.

I'm Suzanne Bard.

Picture a small kangaroo. You're basically seeing something very much like the Australian marsupial called the swamp wallaby.

They're also known as black stinkers because of their distinctive odor.

I can't really describe it except to say it's quite a pungent smell.

It's not terribly pleasant.

University of Melbourne biologist Marilyn Renfrey, who says that their unique scent isn't the only thing that set swamp wallabies apart from their evolutionary relatives.

She and her colleagues recently discovered that adult female

swamp wallabies can carry two pregnancies in different stages of development at the same time.

That's possible because, like other kangaroos and wallabies, they have not just one uterus,

but two. But unlike their close relatives, pregnant swamp wallabies mate again

a day or two before they give birth. We only know that strategy in one other mammal, and that's

the European hair. And the European hair does this mating while they're pregnant, a phenomenon

known as superfeitation. So they... The wallabies have effectively a fetus at an advanced stage pregnancy and a very, very early

conceptus at the same time.

Renfri and her team confirmed the simultaneous pregnancies using high-resolution

...