Black Scoter

Fascinating facts about the Black Scoter

• A black scoter can dive to 60 metres—deeper than a ten-storey building is tall—to hunt mussels and clams on the seafloor. Their bones are denser than other ducks', a trade-off that makes them heavier but gives them the ballast to sink without using energy to swim downward. They spend half their waking hours underwater, eyes open in near-total darkness, feeling for prey by touch alone.
• Male black scoters produce a call so unusual that Audubon himself thought he was hearing a musical instrument: a liquid, hollow whistle that sounds like someone blowing across the top of a bottle. They learn this call as ducklings and refine it over their first winter, each region's population developing its own dialect. Females respond only to males from their own population, keeping flocks genetically distinct across 4,000 kilometres of coastline.
• Every spring, black scoters fly from Atlantic wintering grounds to Arctic breeding grounds in 48 hours flat—a non-stop journey of over 2,000 kilometres on wings that span just 85 centimetres. They fatten up beforehand, gaining 30 percent of their body weight in two weeks, then burn it all in one marathon flight while navigating by landmarks, ocean swells, and magnetic cues. Exhaustion kills thousands during bad-weather years.
• A black scoter's digestive system can crack open mussel shells that would require pliers to open by hand. Their gizzard—a muscular stomach chamber—grinds shells into powder while stones lodged inside act as millstones, breaking apart food that would poison other ducks if ingested whole. This adaptation lets them access food sources no other waterfowl can exploit, but makes them catastrophically vulnerable to oil spills, which coat shellfish and poison them within hours.
• Black scoter populations have crashed by 65 percent since the 1980s, a steeper decline than any other North American duck. Climate change is melting Arctic tundra breeding grounds, commercial fishing is depleting their mussel-bed food sources, and oil exploration threatens their wintering waters. They are one of the few wild duck species most people will never see, despite flying past major cities twice a year.

At a glance

About the Black Scoter

In the dark, mysterious waters of the northern hemisphere, the Black Scoter glides with an air of quiet elegance, its sombre plumage allowing it to blend seamlessly into the shadows. As it paddles through the waves, its webbed feet propel it with a soft, muted rhythm, a testament to its remarkable adaptability in a world where subtlety can be a powerful survival tool. With its haunting, whispered calls carrying across the water, this enigmatic bird navigates the delicate balance of its fragile ecosystem, a true marvel of evolutionary resilience.

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