Non-breeding adult. Photo: Trish O'Keefe/Audubon Photography Awards
Calidris alba
| Conservation status | May be seriously declining; some surveys show an 80% drop in numbers in the Americas since early 1970s. Relies heavily on a few staging areas in migration, and vulnerable to destruction of those sites. |
|---|---|
| Family | Sandpipers |
| Habitat | Outer beaches, tideflats, lake shores; when nesting, stony tundra. At most seasons found on sandy beaches washed by waves. Sometimes on rocky shorelines, less often on mudflats. Typically coastal, but a few stop over on lake shores inland. In breeding season, mostly far above Arctic Circle on rather dry, rocky tundra with growth of moss, lichens, low plants, generally close to lakes or ponds. |
Chases the waves mostly to find sand crabs, which lie buried in intertidal zone and are easiest to spot just after a wave retreats. Sanderlings also probe in sand and mud for other creatures, and move rapidly while picking items from surface.
4, sometimes 3. Olive-green to pale brown, sparsely spotted with brown and black. Incubation is by both sexes, 24-31 days. Sometimes female lays 2 clutches in separate nests and male incubates one set, female the other. At other times, female may have two mates, leaving each male to care for a set of eggs and young, while female departs. Young: Downy young leave nest shortly after hatching, are tended by one or both parents. If both parents are present at first, female may leave within a few days. Young feed themselves. Age at first flight about 17 days.
Downy young leave nest shortly after hatching, are tended by one or both parents. If both parents are present at first, female may leave within a few days. Young feed themselves. Age at first flight about 17 days.
Mostly sand crabs and other invertebrates. Feeds on a wide variety of small creatures on beach, including sand crabs, amphipods, isopods, insects, marine worms, small mollusks; also may eat some carrion. Wintering birds on southern coasts may eat corn chips and other junk food left by people. In spring, may feed heavily on eggs of horseshoe crab. On tundra, feeds mostly on flies and other insects, also some seeds, algae, and leaves.
In breeding season, unmated male performs low display flight, alternately fluttering and gliding, while giving harsh chirring song. On ground, male runs up to female with feathers ruffled, head hunched down on shoulders. Nest site is on ground, usually in open and rather barren spot which may be higher than surroundings. Nest is shallow scrape, often lined with small leaves.
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