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

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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The bard owl has a very distinctive call.

That's the one that goes. Who cooks for you?

Connor Wood is a conservation biologist and applied ecologist at the University of Wisconsin-Madison,

who happens to do a pretty great

barred owl impression himself. Barred owls are native to the eastern U.S., but in the last century,

they've crossed the Great Plains, flooded into Canada, and taken up roost in the Pacific Northwest,

where they're a major threat to northern spotted owls. Bard owls are bigger and more aggressive than spotted owls.

And so barred owls have been able to basically drive spotted owls out of their preferred nesting areas.

And also because they're more flexible in what they eat, there can be lots more barred owls on the landscape.

And now they're invading the Sierra Nevada mountains further south, the native range of the

California spotted owl.

And the big question was, what is the size of the barred owl population there and how fast is it

growing?

To answer that, Wood and his team deployed audio recorders in roughly a thousand locations

throughout 2300 square miles of the northern Sierra Nevada.

And then they listened for two years, collecting the faint calls of spotted owls and barred owls too.

...