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This is Scientific Americans' 60-second science. I'm Karenkin. Got a minute? It may not be the most

melodious bit of bird song you'll ever encounter. But this particular call, issued by a tufted titmouse,

conveys important information about the presence of potential predators. But only if other birds can hear it.

Unfortunately, near a highway, traffic sounds can drown out such alarm calls.

Scientists have long observed a decrease in wildlife population in habitats adjacent to major roadways,

and many figured it was the noise that drives creatures to high-tail it someplace more remote.

But it could be more than mere annoyance that keeps animals away.

The inability to hear potentially life-saving calls could also be a factor.

That's according to a study in the journal Biology Letters.

To test that theory, Aaron Gray and Catherine Seaving at the University of Florida

got hold of a

titmouse alarm call, produced by a captive individual that had spotted an owl. They then played

this alarm call from speakers mounted in different locations in Florida State Parks. Some of the

spots were noisy, along Interstate 75 or U.S. Route 441, others were more secluded and relatively quiet.

The scientists then observed the reactions of Cardinals to these broadcasted declarations of danger,

because Cardinals and other birds often eavesdrop on the talk of titmice for news of impending peril.

In the quiet areas, Cardinals clearly responded to the titmouse alarms.

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