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 about south from Cape Cod. Together with the small islands of Tuckernuck and Muskeget, it constitutes the Town and County of Nantucket, a combined county/town government that is part of the U.S. state of Massachuse ...

Massachusetts Massachusetts (Massachusett language, Massachusett: ''Muhsachuweesut assachusett writing systems, məhswatʃəwiːsət'' English: , ), officially the Commonwealth of Massachusetts, is the most populous U.S. state, state in the New England ...

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

adipose tissue Adipose tissue, body fat, or simply fat is a loose connective tissue composed mostly of adipocytes. In addition to adipocytes, adipose tissue contains the stromal vascular fraction (SVF) of cells including preadipocytes, fibroblasts, vascular e ...

from a

whale Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. As an informal and colloquial grouping, they correspond to large members of the infraorder Cetacea, i.e. all cetaceans apart from dolphins and ...

.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