Researchers from the Smithsonian have been visiting a marsh along the Hackensack River in Carlstadt to study Swamp Sparrows, with an assist from the New Jersey Meadowlands Commission.
There are two types of Swamp Sparrows in the Northeast. One frequents uplands, the other likes coastal plains.
The Carlstadt marsh is one of the few places where both species occur and adapt, over time, to thrive in the salt marsh.
Researchers are banding and cataloging the Swamp Sparrows, and looking into how they evolve for their environment.
More on Coastal Plain Swamp Sparrows here, with a link to Coast Plain Swamp Sparrow Facebook Page. Photo of banded Coastal Plain Swamp Sparrow follows.