The Nantucket Blob was a

globster A globster or blob is an unidentified organic mass that washes up on the shoreline of an ocean or other body of water. A globster is distinguished from a normal beached carcass by being hard to identify, at least by initial untrained observers, ...

that washed ashore on

Nantucket Island Nantucket () is an island in the state of Massachusetts in the United States, about south of the Cape Cod peninsula. Together with the small islands of Tuckernuck and Muskeget, it constitutes the Town and County of Nantucket, a combined cou ...

Massachusetts Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...

, in November 1996. Analysis of samples in 2004 suggests that the Nantucket Blob was a large mass of

adipose tissue Adipose tissue (also known as body fat or simply fat) is a loose connective tissue composed mostly of adipocytes. It also contains the stromal vascular fraction (SVF) of cells including preadipocytes, fibroblasts, Blood vessel, vascular endothel ...

from a

whale Whales are a widely distributed and diverse group of fully Aquatic animal, aquatic placental mammal, placental marine mammals. As an informal and Colloquialism, colloquial grouping, they correspond to large members of the infraorder Cetacea ...

.Pierce, S., S. Massey, N. Curtis, G. Smith, C. Olavarría & T. Maugel 2004
Microscopic, Biochemical, and Molecular Characteristics of the Chilean Blob and a Comparison With the Remains of Other Sea Monsters: Nothing but Whales.
''Biological Bulletin'' 206: 125–133.

References

{{Globsters Globsters 1996 in Massachusetts Nantucket, Massachusetts Individual cetaceans