The Amsterdam Duck or Amsterdam Island Duck (Anas marecula) was a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of waterfowl

Waterfowl

Waterfowl are certain wildfowl of the order Anseriformes, especially members of the family Anatidae, which includes ducks, geese, and swans....

 in the Anatidae

Anatidae

Anatidae is the biological family of birds that includes ducks, geese and swans. The family has a cosmopolitan distribution, occurring on all the world's continents except Antarctica and on most of the world's islands and island groups...

 family. It was endemic to Île Amsterdam

Île Amsterdam

New Amsterdam, Amsterdam Island, or Île Amsterdam is a French island in the Indian Ocean located at . It is part of the French Southern and Antarctic Lands.- History :...

 (Amsterdam Island), French Southern Territories

French Southern Territories

The French Southern and Antarctic Lands , full name Territory of the French Southern and Antarctic Lands , consist of:...

. This flightless species is only known from bone

Bone

Bones are rigid organs that constitute part of the endoskeleton of vertebrates. They support, and protect the various organs of the body, produce red and white blood cells and store minerals. Bone tissue is a type of dense connective tissue...

s and was presumably driven to extinction

Extinction

In biology and ecology, extinction is the end of an organism or of a group of organisms , normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point...

 by whalers

Whalers

Whalers may refer to:* Danbury Whalers,US ice-hockey team in the Federal Hockey League* Eden Whalers, Australian Rules Football team* Hartford Whalers, former US ice-hockey team* New Bedford Whalers, name of three US soccer teams...

 visiting the island..
During his visit to neighbouring Île Saint-Paul

Île Saint-Paul

Île Saint-Paul is an island forming part of the French Southern and Antarctic Lands in the Indian Ocean, with an area of . It is located about southwest of the larger Île Amsterdam, and south of Réunion...

 (St. Paul Island) on 2 February 1793, explorer John Barrow

Sir John Barrow, 1st Baronet

Sir John Barrow, 1st Baronet, FRS, FRGS was an English statesman.-Career:He was born the son of Roger Barrow in the village of Dragley Beck, in the parish of Ulverston then in Lancashire, now in Cumbria...

 mentioned the presence of "a small brown duck, not much larger than a thrush

Thrush (bird)

The thrushes, family Turdidae, are a group of passerine birds that occur worldwide.-Characteristics:Thrushes are plump, soft-plumaged, small to medium-sized birds, inhabiting wooded areas, and often feed on the ground or eat small fruit. The smallest thrush may be the Forest Rock-thrush, at and...

" that was "the favourite food of the five sealers living on the island". This may be the same or a similar species.