I waited for better light in the afternoon and found the black-crowned night heron mentioned by Jared Fisher perched above Seneca Creek. Below Riley's Lock I photographed 8 horned grebes in various degrees of molting into their breeding plumage. Red-breasted mergansers numbered >30. Also 4 ring-necked and a pair for wood ducks on the Potomac

The common loon from last week is still upstream of Rileys. One palm warbler was just upstream of Rileys.

Dave Roberts
Bethesda

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