スミソニアン国立動物園のインスタグラム(smithsonianzoo) - 2月15日 00時29分

The common nighthawk—known for its evening dances to catch insects—is disappearing from parts of its range. Why? A new study led by Smithsonian Migratory Bird Center and University of Alberta biologists has created a comprehensive picture of the 10,000 km. migratory route of common nighthawks using GPS data. The study is the first step in analyzing where and why nighthawk population numbers are declining. #WeSaveSpecies #BringBirdsBack

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