Question: 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 ?
Sentence (from "Gull Island vole"): The Gull Island vole ("Microtus pennsylvanicus nesophilus") is a subspecies of the Meadow Vole last collected in 1897.
Relevant evidence: No