Curlew Sandpiper

Fascinating facts about the Curlew Sandpiper

• A curlew sandpiper weighs less than a golf ball — 30 to 60 grams — yet twice yearly it crosses entire continents and oceans. From Arctic tundra breeding grounds to African and Asian wintering sites, some birds rack up 30,000 km per year. A few individuals have been tracked flying non-stop over the Indian Ocean for 4,000 km without landing. That's equivalent to a human sprinting across a country without sleep or food.
• The curlew sandpiper's downward-curved bill is not for show — it's a precision tool evolved to probe wet sand and mud at angles its cousins' straight bills cannot reach. The bill tip contains thousands of sensory nerve endings that detect the electrical fields generated by tiny amphipods and insect larvae buried centimetres deep. It hunts blind, reading prey location through touch alone, like a living divining rod.
• In 2003 the world's curlew sandpiper population was estimated at 200,000 birds. By 2019 it had crashed to 100,000 — a 50% collapse in 16 years. The cause: wetland drainage across the East Asian flyway, where birds refuel during migration. Without these pit stops, thousands fail to reach breeding grounds or arrive too weak to reproduce. This bird's survival hinges on wetlands no one visits, in countries most of us cannot name.
• Before nesting, curlew sandpipers undergo a moult in the Arctic that transforms them. Their drab winter plumage of grey and white shifts to chestnut-red on the head, neck and breast — a breeding dress so vivid it looks painted on. This colour change is powered by seasonal daylight; birds kept in artificial darkness won't shift colour no matter how well-fed. Their body clock reads the sun itself.
• A curlew sandpiper chick, fluffy and the size of a marble, must be ready to migrate alone within 8 weeks of hatching. Parents abandon their young before they even fledge, leaving chicks to navigate thousands of kilometres to wintering grounds they've never seen, using only an inherited map written in their DNA. They will never meet their parents again. Fewer chicks survive the journey now than a decade ago.

At a glance

About the Curlew Sandpiper

As the tide recedes, the Curlew Sandpiper emerges, a whirlwind of chestnut and white feathers, its long, black bill probing the exposed mudflats with an air of urgent intent. With each fleeting step, it dances across the shoreline, its slender legs a blur as it pursues the tiny crustaceans and mollusks that lie hidden beneath the surface. In its migrations, this diminutive bird undertakes a journey of epic proportions, bridging continents and defying the elements with a resilience that belies its fragile, waif-like form.

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