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In this Sept. 16, 2015 photo, houses finches are kept in Virginia Tech's new research aviary on the campus in Blacksburg, Va. The enclosure allows researchers to study birds in seminatural environments while protecting them from predators and extreme weather. (Matt Gentry/The Roanoke Times via AP)

In this Sept. 16, 2015 photo, houses finches are kept in Virginia Tech's new research aviary on the campus in Blacksburg, Va. The enclosure allows researchers to study birds in seminatural environments while protecting them from predators and extreme weather. (Matt Gentry/The Roanoke Times via AP)

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