At the mouth of the Merrimack River, in Salisbury, large expanses of Salt Marsh border the river on its north side, opposite the tidal flats and downtown buildings of Newburyport.
The productive beds of Spartina grass here are at the bottom of the estuarine food web. In one way or another, these marshes feed roosting and wintering Bald Eagles (Threatened), Atlantic and Shortnose Sturgeon (both state and federally Endangered) heading upstream to breed, and Common, Least, Arctic, and occasionally Roseate Terns (all Special Concern except Roseates, which are both state and federally Endangered) diving for small fish in the tidal waters.
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