An obscure crustacean that measures less than an inch is said to inhabit Rock Creek Park in Washington, D.C. If this is proven, it could hamper construction of the $2.2 billion Purple Line rail project in Maryland. The Hay’s Spring amphipod is on the endangered species list and is federally protected. "Pretty significant mitigation" would be needed to build the light-rail line if the amphipod is found in the project's impact area, according to Henry Kay, the state’s executive director for transit development.

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