A dewy spring morning. Grey-headed herons rise gracefully, trailing their long legs behind. A white egret picks its way through a marsh. The sun, still low enough to cast long shadows, glints off dams ...
At a stop along the Merrimack River, we scan the Joppa Flats at high tide awash with white caps. Near the center of the river, gulls — ring-billed, herring and the occasional black-backed — are joined ...