- 5.1–5.9 in
- 11.4–11.8 in
- 0.7–1.1 oz
- Correlimos semipalmeado (Spanish)
- Bécasseau semipalmé (French)
- Semipalmated Sandpipers from eastern populations probably undertake nonstop transoceanic flights of 3,000 - 4,000 km (1,900 - 2,500 mi) from New England and southern Canada to South America, powered by extensive fat reserves.
- The Semipalmated Sandpiper gets its common name from the short webs between its toes ("palmated" means webbed). The Western Sandpiper is the only other small sandpiper with similarly webbed toes.
- The oldest recorded Semipalmated Sandpiper was at least 14 years, 2 months old when it was recaptured and rereleased during banding operations in New Brunswick.
Breeds on open tundra, generally near water. Winters and migrates along mudflats, sandy beaches, shores of lakes and ponds, and wet meadows.
- Condition at Hatching
- Active and covered with down.
The Semipalmated Sandpiper has three North American breeding populations: western (Alaska), central (western Canadian Arctic), and eastern (eastern Canadian Arctic). A 2012 study estimated a total population of 2.26 million breeding birds, with 1.45 million in the western population, and 810,000 in the central and eastern populations. Population trends have fluctuated over the last several decades. Overall, it appears that the Alaskan and central populations are currently stable, with possible increases in some areas, and the eastern population is declining. Semipalmated Sandpiper is on the 2014 State of the Birds Watch List, which lists bird species that are at risk of becoming threatened or endangered without conservation action.
- Gratto-Trevor, C. L. 1992. Semipalmated Sandpiper. In The Birds of North America, No. 6 (A. Poole, P. Stettenheim, and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, DC: The American Ornithologists' Union.
- Andres, B.A., P.A. Smith, R.I.G. Morrison, C.L. Gratto-Trevor, S.C. Brown, and C.A. Friis. 2012. Population estimates of North American Shorebirds, 2012. Wader Study Group Bulletin 119:178–194. Available from the U.S. Shorebird Conservation Plan website.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- USGS Patuxent Wildlife Research Center. 2014. North American Breeding Bird Survey 1966–2014 Analysis.