Mammals of Fire Island
More than 30 species of mammals either visit or live within the boundaries of Fire Island National Seashore. These mammals range in size from finback whales and other whales—which occasionally swim close to shore or wash up on the beach—to the tiny masked shrew, which though rarely seen, is very common throughout the island. Learn more about marine mammals and white-tailed deer.
Seventeen species of terrestrial mammals were identified on Fire Island during surveys conducted in 1974.
In the mid-1970s, eastern cottontail rabbits (Sylvilagus floridanus) were abundant throughout the Seashore. Red foxes (Vulpes vulpes) were very common. Raccoons (Procyon lotor) were far less numerous. The white-footed deer mouse (Peromyscus leucopus) and meadow voles were abundant, and muskrats (Ondatra zibethicus) and Norway rats (Rattus norvegicus) were numerous on both Fire Island and on the mainland at the William Floyd Estate. Squirrels were restricted to the mainland.
Other common species identified in the survey included the masked shrew (Sorex cinereus), short-tailed shrew (Blarina brevicauda), and weasel (Mustela spp.). Weasels and mink were secretive but locally common predators throughout the seashore in the mid-1970s.
The little brown bat (Myotis lucifugus) was one of two bat species identified on Fire Island, while eight species were recorded at the William Floyd Estate.
Feral cats and dogs have been added to the list of mammals on Fire Island. Their impact on native wildlife is considered to be significant.