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In this photo taken Wednesday, Feb. 11, 2015, dozens of a tiny destructive New Zealand mudsnails are displayed with a penny to show the scale of the one-eighth of an inch creature at a lab in Bellevue, Wash. Scientists are turning to environmental DNA, or eDNA, an emerging surveillance tool that detects the presence of an organism by analyzing cellular material such as urine, hair, feathers or skin cells that are left behind in the environment. From Asian carp in the Great Lakes basin to salamanders in Kentucky to great crested newts in the United Kingdom, the tool is helping biologists look for reclusive or rare imperiled species, monitor unwanted creatures or gauge the overall biodiversity of a lake or stream. (AP Photo/Elaine Thompson)

In this photo taken Wednesday, Feb. 11, 2015, dozens of a tiny destructive New Zealand mudsnails are displayed with a penny to show the scale of the one-eighth of an inch creature at a lab in Bellevue, Wash. Scientists are turning to environmental DNA, or eDNA, an emerging surveillance tool that detects the presence of an organism by analyzing cellular material such as urine, hair, feathers or skin cells that are left behind in the environment. From Asian carp in the Great Lakes basin to salamanders in Kentucky to great crested newts in the United Kingdom, the tool is helping biologists look for reclusive or rare imperiled species, monitor unwanted creatures or gauge the overall biodiversity of a lake or stream. (AP Photo/Elaine Thompson)

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