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Calidris pusilla(Linnaeus, 1766)
Common Name: Semipalmated sandpiper, Playero semipalmeado

This species can be observed along the Caribbean and Pacific coast of Panama. It is more abundant on the Pacific side. The species feeds mostly on coastal tidal flats, on marshes and on beaches, but rarely goes far from the coast.
Calidris pusilla breeds in arctic North American and migrates south along the coasts of Panama and South America.
Natural History Notes
During nonbreeding season, this bird is almost identical to the other species Calidri Mauri. In order to differentiate them, you need to rely on the call differences.

Conservation status according to IUCN 2008 Red list: Least Concern (LC).

The total length of this species varies between 15.24 cm and 16.51 cm (measured from tip of bill to end of tail). The beak and the legs are both black and the beak is fairly short, especially for the males. This species can be seen in Panama when it shows its nonbreeding plumage. The part above is brown-gray with whitish superciliary. The part below is white but we can distinguish a grayish gradient toward the sides of the chest. The wings have white stripes and a black band in the center.
The juvenile looks similar to the adult, but the feathers have a paler coloration.

Compiled by
Zoe Joly-Lopez
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IUCN 2008. 2008 IUCN Red List of Threatened Species.

Ridgely, Robert. S. and John. A. Gwynne. Jr. 1989. A Guide to the Birds of Panama. Second Edition. Princeton University Press. Princeton, New Jersey. 534 p.

Wetmore, Alexander. 1968. The birds of the Republic of Panamá. Part 2. Columbidae (Pigeons) to Picidae (Woodpeckers). Washington DC: Smithsonian Institution Press.
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