Habitat: This species can be observed along the Caribbean and Pacific coast of Panama during winter and is more abundant on the Pacific side. Distribution: This species breeds in North America and migrates south to southern United States, northeastern Brazil and northern Chile. Natural History Notes: Along with the Whimbrel, the Catoptrophorus semipalmatus is the commonest large shorebird of Panama. We can see this species roosting in mangroves at high tide. They usually stay in groups, but will scatter to feed. Conservation status according to IUCN 2008 Red list: Least Concern (LC). Characteristics: The total length of this species varies between 35.56 cm and 40.64 cm (measured from tip of bill to end of tail). The bill (beak) is heavy, long and black with a paler coloration at the base. The legs are gray. This species can be seen in Panama when it shows its nonbreeding plumage. The part above and the breast have a rather plain coloration, with a mixture of pale gray and light brown. This coloration changes toward whitish on the throat and the belly. When they are flying, we can easily distinguish a large white stripe on the wing and the black outer wing. We can also see that the rump is white and the tail is gray.