Semipalmated Sandpiper (Calidris pusilla) lives in arctic tundra across North America. It feeds on small invertebrates & crustaceans. Its conservation status is Near Threatened.
Fascinating facts about the Semipalmated Sandpiper
- Every autumn the species launches on nonstop flights of 3 000-4 000 km from the Arctic tundra to South America, a distance comparable to crossing the United States twice. During these journeys they gather in flocks that can swell to 350 000 birds, forming a living cloud that darkens the sky like a low-altitude storm. Such massive congregations are essential because they overwhelm predators.
- On the tundra, a male builds up to a dozen shallow scrapes, but the female chooses just one to line with grass and other material before laying 3-4 eggs at 24- to 32-hour intervals. Both parents then share incubation duties for 18-22 days, after which the precocial chicks hatch and begin feeding within hours. This rapid turnover, four eggs in a single brood and a fledging period of just 16-19 days.
- Adult semipalmated sandpipers face a harsh survival odds curve: each year 50% to 70% of them survive, and reaching the recorded maximum age of 16 years is a 1-in-10 000 event. This low long-term survival underscores how critical safe stop-over sites and wintering habitats are; even a small increase in mortality at any point can tip the population toward decline despite their large numbers.
- At just 15-18 cm long and weighing only 18-51.5 g, the semipalmated sandpiper fits on the tip of a ruler and is lighter than a deck of cards. Its wingspan stretches just 35-37 cm, barely the width of a standard school notebook.
- During spring migration the sandpipers time their stop-overs to the spawning of horseshoe crabs.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
At a glance
RangeNorth America
HabitatArctic tundra
DietSmall invertebrates & crustaceans
About the Semipalmated Sandpiper
As the tide recedes, a diminutive figure darts across the exposed mudflats, its feet a blur as it pursues the tiny crustaceans that lie hidden in the sediment. The Semipalmated Sandpiper, a petite but resolute traveler, moves with an air of quiet urgency, its brown plumage allowing it to blend seamlessly into the muted tones of its surroundings. With a population that migrates thousands of miles each year, this remarkable bird's journey is a testament to its unyielding spirit and adaptability in the face of an ever-changing world.
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