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This is Scientific Americans' 60-second science. I'm Karen Hopkin.

In the wild, monkeys need to keep their eyes peeled for all sorts of dangers, like leopards and eagles and snakes.

But the green monkeys studied by Julia Fisher of the German primate center have an additional challenge.

They also have to scan the skies for drones.

Why did we fly a drone over green monkeys, one may ask? One may indeed. The answer is that Fisher

and her colleagues are interested in how primates communicate. In a classic study back in the 1980s,

scientists showed that East African vervet monkeys produce alarm calls that are specific for the

predators they encounter. So, for example, vervet monkeys hearing a leopard alarm might scurry up a tree,

whereas the eagle call sends them running for cover under the closest shrub. Now, the green

monkeys that live in Senegal share a similar system to warn of leopards and

snakes. But they aren't known to raise a ruckus in response to birds of prey. And so therefore we

decided to fly a drone over them. The researchers treated 80 green monkeys to a show of drones.

How did the animals react to this unfamiliar aerial intruder? The monkeys did respond. They responded with alarm calls, and they responded by running away.

But here's where things get really interesting.

The calls the green monkeys made, after spotting the drones, were different from the ones they used to signal leopards or snakes.

But even more intriguing.

When we did an acoustic analysis, these alarm cords were almost eerily similar to the ones of the East African vervet.

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