Passerculus sandwichensis princeps

From the Cornell Lab of Ornithology web site: The "Ipswich Savannah Sparrow," a subspecies that breeds on Sable Island, Nova Scotia, is nearly 50 percent heavier than most other Savannah Sparrow subspecies. It is the palest race, and is found in winter in sand dunes along the Atlantic Coast. It was formerly considered a separate species.