Boston Harbor Islands National Recreation Area

Nature & Wildlife in Boston Harbor Islands

Natural World

Intertidal and Subtidal Zones Boston Harbor Islands national park area, encompasses about 60 km of shoreline on more than 30 islands. The intertidal zone, or the area between the reaches of high tide and low tide, includes a diversity of habitats such as bedrock outcrops, tide pools, rock, cobble and ...

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Geology

Education Themes: Geology Island Formation Boston Harbor is part of the Boston Basin, a topographic lowland underlain by sedimentary layers deposited at the end of the Precambrian time. Where bedrock is exposed (Calf Island, the Brewsters, and small islands near Hingham), it is a ...

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Plants

Marine Plants / Algae The once-plentiful eelgrass is the only type of seagrass now present in Boston Harbor; it is now confined to only four isolated areas, the largest of which is near the south coast of Bumpkin Island. Seagrass beds are critical wetlands components of shallow coastal ecosystems where ...

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Animals

Birds Field surveys have identified more than 100 bird species including gulls, terns, herons, ducks, geese, hawks, plovers, sandpipers, doves, owls, woodpeckers, and perching birds. During migration, large numbers of shorebirds utilize the mudflats and salt marshes around the harbor, while transient hawks and songbirds regularly make use of the ...

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