Erin Ross Jun 22
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DC's tiny, endangered species reveals itself

Catalog number: USNM 142770 (Department of Invertebrate Zoology / Smithsonian Institution)

A new study used DNA gathered from stream water to confirm the presence of a tiny endangered crustacean within miles of the White House.

The Hay's Spring amphipod is only found in one place on earth: Rock Creek Park, a narrow, winding valley that cuts through the heart of Washington, DC. The shrimp-like animal is difficult to study: when scientists dig through leaves and rocks to look for it, they also destroy its habitat and to identify it, they need to take it back to the lab and kill it. Now scientists say they can detect small amounts of DNA left behind by the animal — proving it still exists even though it's rarely seen.