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This is Scientific Americans' 60-second science. I'm Jason Goldman. Got a minute?

The giraffe is an icon of the African savanna. The lion is the top predator of the ecosystem.

Both animals face uncertain futures and both are the subjects of intense ongoing conservation

work. Now a study suggests that saving one might mean bad news for the other.

When I was out in the field, I heard anecdotes from people that in one of my study sites,

there were very few juvenile giraffes because apparently the lions in the area had developed

a preference for taking young giraffes.

University of Bristol biologist Zoe Muller.

Working in Kenya's Great Rift Valley, she focused her attention on two neighboring sites,

a national park with lots of lions and a privately owned conservancy with no lions.

In a lion-free conservancy,

26% of the giraffes were less than one year old.

But in a lion-filled park,

juvenile drafts made up only 5% of the species population.

So I was able to show, really,

that actually in the presence of lions,

the number of juveniles is severely reduced,

...