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This is Scientific American's 60-second science.'m Christopher in Taliatta. Got a minute?

Building a road through wilderness certainly has a visible effect on local flora and fauna.

You're physically paving over a slice of what was once habitat. But roads have less obvious effects, too.

Like the introduction of traffic noise, which also takes a toll.

You can see an oil spill, but you can't see, you know, a traffic noise spill.

So convincing people that it's important, I think, is a little more difficult.

Heidi Ware, an ornithologist at the Intermountain Bird Observatory in Boise, Idaho.

She and her colleagues studied the reactions by birds to the sounds of vehicles, and they did it without paving the great outdoors.

Instead, they mounted 15 pairs of speakers on Douglas fir trees along a ridge near Boise, and played traffic noise.

They thus created what they call a phantom road through the wilderness, which boosted local

noise levels about 10 decibels higher than those in the surrounding forest.

Turns out just the sounds of traffic scared away a third of the area's usual avian visitors,

and cut species diversity too.

And birds of multiple species weren't able to pack on as much fat to fuel their migrations when they were forced to dine

to the soundtrack of traffic. Follow-up experiments in the lab found that, when it's noisy,

birds spend a lot less time head down pecking at food and a lot more time scanning their surroundings.

You can imagine if you take away that ability to listen for predators, birds need to compensate

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