Podilymbus gigas
The Atitlan Grebe (Podilymbus gigas), also known as the Giant Pied-billed Grebe, was an extraordinary and unique flightless waterbird endemic solely to Lake Atitlán in the highlands of Guatemala. Growing significantly larger than its closest relative, the Pied-billed Grebe, adults reached lengths of 46-50 cm (18-20 inches) and weights over 800 grams (1.75 lbs). Its plumage was predominantly dark brown to blackish on the upperparts, contrasting with a paler, mottled chest and flanks, and a dis...
This highly specialized grebe was strictly confined to the freshwater, high-altitude (approx. 1,560m / 5,120ft) volcanic Lake Atitlán in the highlands of southwestern Guatemala, thriving amidst its extensive reed beds and open water.
The Atitlan Grebe primarily fed on fish, particularly the smaller Cichlid species native to Lake Atitlán, supplemented by aquatic insects and crustaceans, all captured during underwater pursuit dives.
The Atitlan Grebe was a diurnal aquatic bird, spending its days foraging and tending to its floating nests anchored to emergent vegetation. Like other grebes, it was an expert pursuit-diver, propelling itself underwater with powerful leg strokes to catch prey. While details on specific territoria...
The Atitlan Grebe was critically endemic, with its entire historical range confined solely to the volcanic Lake Atitlán in the highlands of Guatemala, situated at an elevation of approximately 1,560 meters (5,120 feet) above sea level. This extreme isolation fostered its unique evolutionary path,...
Extinct
- The Atitlan Grebe was completely flightless, making it an extraordinary example of island gigantism and specialization in an isolated lacustrine environment. - Its extinction in the early 1980s is widely cited as a direct consequence of human activities, primarily the introduction of exotic fis...