Wilson's phalaropes nest in the North American prairies and spends the winter in Peru, Chile, Bolivia and Argentina. After the breeding season they cover a long distance non-stop to the North American salt lakes. At the Great Salt Lake up to 600,000 species and at Mono Lake up to 140,000 Wilson's phalaropes were counted. There they moult and double their weight before flying over the Pacific and the Andes mountains. Adult birds cover this distance (5,000 km) in three days by flying 70 km/h. In the 70s, up to 500,000 species of Wilson phalaropes spent the winter at Mar Chiquita.
