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During the early morning of July 7, 2014 scientists caught 6 black-crowned night-herons at the Smithsonian's National Zoo, weighed them, took a feather sample for DNA testing, tagged them, attached backpack-like transmitters to them, and released them.
The night heron rookery at the zoo is the only one in Washington, D.C. The birds arrive in March and depart in August and September. No one knows where they go.
The transmitters will allow scientists to follow them in their journeys south and to understand their migratory challenges.
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