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This is Scientific Americans 60 Second Science.

I'm Jason Goldman.

About a billion birds die from flying into buildings each year in North America.

Suspitions have been that birds may perceive the open areas behind glass as safe passageways.

Or they may mistake the reflected foliage for the real thing. Researchers would like to reduce collisions, which requires a solid understanding about what makes a bird more or less likely

to die by smacking into a building in the first place. There was, and still is, relatively

little known at a broad scale. Most studies are at one small study site.

Jared Elmore, a graduate student in Natural Resource Ecology and Management

at Oklahoma State University.

He and his colleagues used a previously created data set of building collisions for birds

at 40 sites throughout Mexico, Canada, and the U.S.

The first finding was obvious.

Bigger buildings with more glass kill more birds, but the details were more noteworthy.

We found that life history predicted collisions.

Migrants, insectivores, and woodland inhabiting species collided more than their counterparts.

Most migratory species travel at night when lights near buildings can distract or disorient them.

And Elmore thinks that insect-eating birds might be attracted to buildings because their insect prey is attracted to the lights.

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