The Falkland steamer duck (Tachyeres brachypterus) is a flightless bird native to the Falkland Islands, an isolated archipelago in the South Atlantic Ocean. It is one of the four species of steamer ducks and has evolved to be entirely flightless like most of its relatives. The Falkland steamer duck is uniquely adapted to the coastal marine environment of the islands and is a fascinating example of evolution in an isolated ecosystem.

The Falkland steamer duck is completely flightless, like two of its close relatives, the Fuegian and Magellanic steamer ducks. The species evolved flightlessness due to the lack of predators on the Falkland Islands, where flying was no longer necessary for survival. Instead, their wings are used to "steam" across the water, propelling themselves using their wings and feet in a motion resembling a steamboat.

Their wings are small and have little musculature compared to flying birds, making them incapable of powered flight. They use these wings mainly to aid in swimming.

They feed mainly on marine invertebrates, such as mussels, crabs, and small fish. They forage by diving underwater or picking through rocky shores and tidal pools. Their strong bills are well-suited for breaking into shellfish.

Falkland steamer ducks build nests near the shore, often hidden among rocks, grass, or other coastal vegetation. The female lays 5 to 8 eggs, which she incubates while the male defends the territory.

Both parents are involved in protecting and raising the young. The ducklings are precocial, meaning they are relatively mature and capable of walking and swimming shortly after hatching.

Falkland steamer ducks are primarily found in rocky coastal areas, bays, and estuaries around the Falkland Islands. They are most frequently seen near the shorelines, where they forage for food.