At this sanctuary, a half-mile boardwalk leads you on a fascinating journey through a red maple swamp and small cattail marsh to a salt marsh overlooking the North River. During the spring and summer, the Woodland Loop usually offers a look at scarlet tanagers and ovenbirds. Because the sanctuary attracts a variety of birds and wildlife during different seasons, it’s exciting to visit throughout the year. Harbor seals are visible in the river as they occasionally swim past the platform at the end of the boardwalk