Birds
Sanderling
Calidris alba · also called sanderlings
A wave retreats down a sandy beach, and a small pale bird sprints after it on quick legs, probing the wet sand for an instant before turning to outrun the next wave rolling back in, a rhythm the sanderling repeats without pause for as long as the tide keeps moving.
Overview
The sanderling, Calidris alba, is a small, pale shorebird found on sandy beaches across nearly every continent, breeding in the high Arctic before migrating to a huge range of coastal wintering grounds. Its distinctive wave-chasing foraging rhythm and extraordinarily broad global distribution make it one of the more universally recognisable small shorebirds anywhere.
A bird that races the tide for a living
Few animals time their entire feeding strategy to something as unpredictable as an incoming wave, but the sanderling has turned that exact rhythm into a reliable, repeatable way of life, one sprint at a time.
Status
Least Concern — widespread across suitable sandy beach habitat on nearly every continent, though some regional stopover sites face development pressure.
Sanderling: common questions
Why does a sanderling run back and forth on the beach?
A sanderling chases the retreating swash of each wave to probe the freshly exposed wet sand for buried prey such as mole crabs, then races back up the beach ahead of the next incoming wave, a rhythm timed precisely to the surf that lets the bird feed efficiently without ever getting fully soaked.
Where does the sanderling breed if it's so often seen on tropical beaches?
A sanderling breeds in the high Arctic tundra, among the northernmost-breeding bird species anywhere on Earth, and only moves to the sandy beaches it is more commonly associated with, which can range from temperate coastlines to the tropics, once the short Arctic breeding season ends.
How is the sanderling different from other small sandpipers?
Unlike most other small sandpipers in its genus, the sanderling lacks a hind toe entirely, a distinctive anatomical difference, and it also tends to show notably pale, almost white plumage outside the breeding season, offering effective camouflage against light-coloured sand.
How widespread is the sanderling?
The sanderling is found on sandy beaches across nearly every continent, giving it one of the broadest global distributions of any shorebird species and making it one of the more familiar small birds to beachgoers virtually anywhere in the world.