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The York County Department of Parks and Recreation will host a study of stream habitat, 2-4:30 p.m. Sunday at Nixon County Park.

Naturalist Mary Ronan will search for aquatic macro-invertebrates such as mayfly and dragonfly nymphs.

Participants will learn how to assess the health of the stream and discuss influences affecting water quality.

Closed-toed shoes that can get wet are required.

Admission is free, and registration is not required.

For more information, call 428-1961.

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