An inventory was completed in 2007 to document mammal, reptile, and amphibian species expected to be found on the Boston Harbor Islands. "Due to logistical and budgetary constraints, and the lack of existing data relevant to the islands of Boston Harbor, this project was limited to islands isolated from the mainland...."
Wetland and Aquatic Marine Animals
The Massachusetts Natural Heritage Program lists six rare species known to exist within the park, including two species listed as threatened and four of special concern. They are the birds barn owl, common tern, least tern, and Northern harrier, and the plants sea beach dock and American sea blite.
The US Fish and Wildlife Service reports several federally listed endangered and threatened species of fish, turtles, birds, and mammals near or in coastal waters of Massachusetts, but not known to be found among the Boston Harbor Islands. There are no island species on the federal list.