What  is a 17 acre island separating Long Island and Block Island sounds, that has A ground-dwelling coastal beach grass herbivore endemic of the Meadow Vole ?
Gull Island vole The Gull Island vole ("Microtus pennsylvanicus nesophilus") is a subspecies of the Meadow Vole last collected in 1897. A ground-dwelling coastal beach grass herbivore endemic to Great Gull Island, New York, it disappeared after habitat destruction for naval fortifications in August 1898 for the Spanish–American War. Also, feral cats were also partly responsible in its decline. It is known from fifteen specimens in Washington, D.C.
Columbia Island (New York) Columbia Island (formerly Little Pea Island), is an island in Long Island Sound and part of New Rochelle, New York. It is situated off the south-eastern coast of Davids' Island, immediately adjacent to Pea Island. The island varies in size from about one acre to 175 square feet depending on the tide.