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

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.j.p.

That's y-A-K-U-L-T dot-C-O-J-P.

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

This is Scientific Americans. Science quickly.

I'm Karen Hopkins.

Why did the lion take down a buffalo instead of a zebra? Because of the big-headed ants. I know, I know. Sounds like a riddle

written by a preschooler tripping on pixie sticks and David Attenborough DVDs. But it's actually

the finding of a four-year collaborative study

that showed that the arrival of a single species of invasive ant

can have far-reaching effects that ripple across an entire African ecosystem.

This tangled tale of interspecies intrigue started out as one might expect.

I originally went to Kenya very excited as a graduate student to do something like studied lions.

Todd Palmer is a professor of biology at the University of Florida at Gainesville.

He did his doctoral work with Truman Young at the University of California Davis.

When I arrived in Truman's lab, he said, well, you can study whatever he want.

And I spent some time driving around Impala Research Center and noticed that I didn't see any lions and I couldn't find lions.

And I'd hear them at night and could never track him down.

Then I thought, well, this is hard.

So instead, Todd turned his attention to the local trees because he thought,

...