Overview
The White-winged Coot (Fulica leucoptera) is a common, widespread aquatic rail native to the open lakes, flooded plains, and marshes of southern South America. Named for the conspicuous white trailing edges on its secondaries visible in flight, it is readily distinguished from neighboring coots by its rounded, bright yellow or orange frontal shield and cheerful disposition.
Biology and Physical Characteristics
The White-winged Coot has a compact, duck-like profile with uniform slate-grey plumage that darkens to velvety black on the head and neck. In flight, it reveals brilliant, clean white tips on the trailing edges of its secondary wing feathers. Its bill is bright lemon-yellow, topped by a rounded, lemon-yellow or warm orange frontal shield that lacks any red marks. Its legs are olive-green, bearing long, paddle-like lobed toes.
Behavior and Ecology
An active, buoyant swimmer, the White-winged Coot dabbles at the water surface and executes brief, shallow dives to uproot submerged waterweeds. It is highly gregarious outside the breeding season, joining immense mixed-species rafts alongside red-gartered coots and black-necked swans across the Argentine Pampas. Pairs construct cup-shaped floating nests of dried reeds concealed in thick bulrush stands.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the White-winged Coot is one of the most abundant waterbirds in South America, with an extensive breeding range spanning hundreds of thousands of square kilometers of protected wetlands, lakes, and agricultural floodlands.
Interesting Factoid
While swimming, the White-winged Coot looks almost entirely black, but the second it takes flight it flashes brilliant white wing edges that look like luminous racing stripes across the pampas sky.