Question: Info A: Mullet Key is a historic island within the Florida region, known to harbor oyster shell middens. Info B: Oysters are a family of salt-water organisms that live in marine or brackish habitats. Question: What creature has been known to thrive off the coast of Mullet Key?
Context: Whaleback Shell Midden is a shell midden, or dump, consisting primarily of oyster shells located on the east side of the Damariscotta River in Maine, United States.  It is preserved as a Maine state historic site and was included as part of the Damariscotta Oyster Shell Heaps listed on the National Register of Historic Places in 1969.  Other shell middens are located on the estuary in both Damariscotta and Newcastle.  The middens in this area were formed over about 1,000 years between 200 BC to AD 1000. The Green River Shell Middens Archeological District is a historic district composed of archaeological sites in the U.S. state of Kentucky.  All of the district's sites are shell middens along the banks of the Green River that date from the later portion of the Archaic period. Mullet Key is a historic island near Crystal River, Florida.  It is located 3 miles south of the main mouth of the Crystal River, and was inhabited by Native Americans in pre-Columbian times.  The island was occupied from roughly 500 to 1500 and was inhabited by the Deptford and Safety Harbor cultures.  Oyster shell middens have been found at the site.  On July 3, 1986, it was added to the U.S. National Register of Historic Places. Shell rings are archaeological sites with curved shell middens completely or partially surrounding a clear space.  The rings were sited next to estuaries that supported large populations of shellfish, usually oysters.  Shell rings have been reported in several countries, including Colombia, Peru, Japan, and the southeastern United States.  Archaeologists continue to debate the origins and use of shell rings. Big Mullet Key is an island in the Florida Keys in Monroe County, Florida, United States.  It is within the boundaries of the Key West National Wildlife Refuge. Indian Mound Park, also known as Shell Mound Park or Indian Shell Mound Park, is a park and bird refuge located on the northern shore of Dauphin Island, a barrier island of Mobile County, Alabama in the United States.  In addition to the many birds which visit, a wide variety of botanical species contribute to the natural offerings.  The site is historically significant due to the presence of prehistoric Indian shell middens, mounds composed of discarded oyster shells.  The park was added to the National Register of Historic Places on August 14, 1973.  It is administered by the Alabama Department of Conservation and Natural Resources. The Damariscotta River is a 19.0 mi tidal river in Lincoln County, Maine, that empties into the Atlantic Ocean.  "Damariscotta" is an old Abenaki word for "river of many fishes".  There are 2,500-year-old oyster shell middens (heaps) along the banks of the Damariscotta River, which occupies a drowned river valley leading to the Gulf of Maine, a large embayment of the Atlantic Ocean. Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats.  In some species the valves are highly calcified, and many are somewhat irregular in shape.  Many, but not all, oysters are in the superfamily Ostreoidea. Little Mullet Key is an island in the Florida Keys in Monroe County, Florida, United States.  It is within the boundaries of the Key West National Wildlife Refuge. South-southwest of St. Petersburg, Florida, Fort De Soto Park is a park operated by Pinellas County on five offshore keys, or islands: Madelaine Key, St. Jean Key, St. Christopher Key, Bonne Fortune Key and the main island, Mullet Key.  The keys are connected by either bridge or causeway.  The island group is accessible by toll road from the mainland.  Historically, the islands were used for military fortifications; remnants and a museum exhibit this history.  Two piers, beaches, picnic area, hiking trails, bicycling trails, kayak trail, and a ferry to Egmont Key State Park are available.
Answer: Oyster