Overview
The Giant Coot (Fulica gigantea), known locally as the Pari or Ajoya, is the undisputed heavyweight titan of the global rail family. Confined to freezing, windswept alpine lakes high in the South American Andes up to 5,000 meters above sea level, this colossal, near-flightless waterbird is famous for constructing immense floating fortress nests out of aquatic weeds that can weigh several metric tons.
Biology and Physical Characteristics
Attaining weights exceeding seven pounds, the Giant Coot is twice the size of a standard coot. It has uniform slate-black plumage, deep crimson-red legs and massive lobed feet, and a dark reddish bill capped with a tri-colored frontal shield of white, yellow, and red. Due to its enormous body mass relative to its small wings, adult Giant Coots are practically flightless, rarely if ever becoming airborne.
Behavior and Ecology
Extremely territorial, Giant Coot pairs maintain life-long bonds and defend exclusive lake territories year-round. Together, the pair dives repeatedly to dredge up massive quantities of waterweeds, piling them into an enormous artificial island nest up to 4 meters (13 feet) in diameter and 3 meters deep, which can support the weight of a grown human without sinking.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the Giant Coot is well protected by the extreme remoteness and severe climate of the Andean Altiplano. Primary long-term threats include water extraction for lithium and copper mining that dries up fragile alpine lagoons, and climate change-induced glacier retreat.
Interesting Factoid
The Giant Coot is so heavy that adults cannot fly; instead, a mated pair spends months building a gigantic floating island nest out of lake weeds that can weigh over two tons and easily support a standing human.