The great grebe (Podiceps major) is the largest species of grebe in the world. 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 is a very large grebe, with proportions more like a goose or a cormorant than a typical grebe. They range in length from 67 to 80 cm and usually weigh about 1,600 g, but can scale to at least 2 kg. 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.