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Great Grebe In Rio Grande do Sul, Brazil Conservation status Least Concern (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Aves Order: Podicipediformes Family: Podicipedidae Genus: Podiceps Species: P. major Binomial name Podiceps major (Boddaert, 1783) The Great Grebe (Podiceps major) is the largest species of grebe on earth. A disjunct population exists in northwestern Peru, while the main distribution is from extreme southeastern Brazil to Patagonia and central Chile. The population from southern Chile is considered a separate subspecies, P. m. navasi. This species occurs mainly in open waterways. Most birds are seen on low altitude lakes and sluggish rivers (often surrounded by forests), as well as estuarine marshes. While breeding, it frequents the heavily vegetated inlets off of large lakes. Outside of the breeding season, most birds will move to estuaries and bays, usually heavy with kelp (occasionally, they even are seen on the open sea). Non-breeding birds may live along the coasts all year. In Rio Grande do Sul, Brazil This is a very large grebe, with proportions more like a goose or a cormorant then a typical grebe. They range in length from 67–80 cm (26-32 inches) and usually weigh about 1600 grams (3.5 lb), but can scale to at least 2 kg (4.4 lb). They are buffy-rufous on the neck and chest, blackish on the back and have a whitish belly. The head is sooty gray with a reddish brown eye. Due to its size and unique coloration, the Great Grebe is unlikely to be confused with any other bird, including other grebes. The Great Grebe lives on a diet mostly of fish, sometimes over 11 cm (4.3 inches) long, but usually smaller. Prey competition can occasionally occur with the Neotropic Cormorant over fish, but that species (in spite of smaller body size) usually takes larger fish. Also insects, crustaceans and mollusks are taken. The diet can switch to almost half crabs during the wintertime along the coasts, and these birds can also take the young of other waterbirds, especially coots. After living in groups numbering up to the hundreds, these birds move inland to breed. Most populations lay their eggs from October to January, becoming later further south. In the isolated Peru population, nesting occurs in September & October, with a possible second clutch in January or February. They are moderately social when breeding, occasionally forming colonies. 3 to 5 eggs (sometimes 6) are laid. Two broods, or possibly more, can be raised at the same time. These birds are widespread and common through most of their range. They have been lucky in that much of their native habitat has not been cleared, especially in the southern portions of their range. References del Hoyo, Elliott & Sargatal. Handbook of Birds of the World, Volume 1 Ostrich to Ducks, ISBN 84-87334-10-5 v · d · eGrebes (order: Podicipediformes • family: Podicipedidae) Genus Species Tachybaptus Little Grebe • Australasian Grebe • Madagascar Grebe • Alaotra Grebe • Least Grebe Podilymbus Pied-billed Grebe • Atitlán Grebe Rollandia White-tufted Grebe • Titicaca Flightless Grebe Poliocephalus Hoary-headed Grebe • New Zealand Dabchick Podiceps Red-necked Grebe • Great Crested Grebe • Slavonian Grebe (or Horned Grebe) • Black-necked Grebe (or Eared Grebe) • Colombian Grebe • Great Grebe • Silvery Grebe • Junin Flightless Grebe • Hooded Grebe Aechmophorus Western Grebe • Clark's Grebe External links