Relative abundance is depicted for each season along a color gradient from a light color indicating lower relative abundance to a dark color indicating a higher relative abundance. The dainty Semipalmated Sandpiper is named for the partial webbing between its toes; the word “palmate” means webbed. Peeps are the suite of small shorebirds that all appear similar and may be difficult to identify. The semipalmated sandpiper (Calidris pusilla) is a very small shorebird.The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. Relative abundance is depicted for each season along a color gradient from a light color indicating lower relative abundance to a dark color indicating a higher relative abundance. It has a short, stout, straight black bill and black legs and feet. It feeds on insects, worms, small molluscs and crustaceans. The Sanderling’s black legs blur as it runs back and forth on the beach, picking or probing for tiny prey in the wet sand left by receding waves. Swift flight on … Semipalmated Sandpiper Calidrispusilla Alternate Plumage Reddish-brown crown Short, straight, black bill Black legs Gray-brown back with some rusty mottling The specific pusilla is Latin for "very small". In the summer, this sandpiper has dark body feathers and in the winter it has more white on its body. FEATURES An adult semipalmated sandpiper is five and one-half to six and one-half inches long. Semipalmated Sandpiper Calidris pusilla. The range map depicts the boundary of the species’s range, defined as the areas where the species is estimated to occur within at least one week within each season. The Semipalmated Sandpiper is one of the species that birders generally refer to as "peeps." Semipalmated Sandpiper: This small sandpiper has scaled grey-brown upperparts, white underparts and fine streaks on the breast and sides. Often hard to see, this adaptation allows the birds to easily walk without sinking over the mud flats where they feed. Range: Post-breeding migration. Three Semipalmated Sandpiper populations breed in northern Canada and in Alaska in the United States: the western (Alaska) population represents about 64% of the population, while the central (western Canadian Arctic) and eastern (eastern Canadian Arctic) populations together represent nearly 36%. They hatch with open eyes and almost adult-sized legs, and as soon as they are dry, they stumble about, pecking for insects. Semipalmated Sandpiper Calidris pusilla Range map: Post-breeding migration Data provided by eBird. Semipalmated Sandpiper chicks are not fed by their parents. The Western Sandpiper is the only other small sandpiper with similarly webbed toes. MIGRATION. Semipalmated Sandpiper Bécasseau semipalmé Calidris pusilla Information, images and range maps on over 1,000 birds of North America, including sub-species, vagrants, introduced birds and possibilities Both sexes are similar in appearance. Semipalmated Sandpipers winter mostly in South America, and studies have shown that they may make a non-stop flight of nearly 2000 miles from New England or eastern Canada to the South American coast. Small and plain in appearance, this sandpiper is important in terms of sheer numbers. Semipalmated Sandpiper Calidrispusilla ~25 g Tiberi Range map by Cormell Lab of Ornithology Semipalmated refers to the semi-webbed toes of this sandpiper. Relative abundance is the estimated number of individuals detected by an eBirder during a traveling count at the optimal time of day. It often gathers by the thousands at stopover points during migration. This small shorebird is found breeding in sub-arctic tundra in northern Canada. 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