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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 pixi 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 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 them down.

Then I thought, well, this is hard.

So instead, Todd turned his attention to the local

trees because he thought well okay this is something that I don't have to chase down

...