Common Tern (Sterna hirundo) lives in coastal marine waters across Europe, Asia and North America. It feeds on fish and crustaceans. Its conservation status is Least Concern.
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A single common tern can sprint across the sky at 43-54 km/h (27-34 mph) while cruising at 1 000-3 000 m (3 300-9 800 ft) during its night-time migration, yet it can drop to a leisurely 30 km/h (19 mph) when the wind is calm. This speed range lets it cover the 25 000 km (15 000 mi) journey from Sweden to New Zealand in just five months, showing how its aerodynamic build and powerful, direct flight let it span continents without stopping for fuel. It also explains why the species can colonise distant islands, from the Azores to the Maldives, far beyond its breeding range.
A common tern's wingspan stretches 77-98 cm (30-39 in) while its body weighs only 110-141 g (3.9-5.0 oz), giving it a wing-loading comparable to a lightweight glider. This low weight lets the bird hover, take off vertically and execute rapid turns while hunting fish just 10-30 m (33-98 ft) above the water in a head-wind, or 30 km/h (19 mph) in calm air. Such agility lets it exploit both sea and freshwater prey, explaining why its diet can include molluscs, crustaceans and insects when fish are scarce.
Common terns replace their primary feathers at least twice a year, sometimes three, a frequency unusual among most birds. Fresh primaries shine with greater ultraviolet reflectance, and females actively choose mates with the brightest, newest wing feathers. Early moult is linked to breeding failure, because both processes are controlled by the hormone prolactin.
Despite a global population of millions, common terns are listed as Least Concern, yet numbers in North America have dropped sharply in recent decades. Habitat loss, pollution and disturbance of breeding colonies, often from picnickers, photographers or plastic debris, still threaten local groups, as seen in Michigan where the species is classified as threatened. This contrast shows that even widespread, adaptable seabirds can become vulnerable when human activity disrupts their nesting ground.
Common terns lay up to three eggs that hatch after about 21-22 days, and the downy chicks fledge in just 22-28 days.
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As the Common Tern dances across the waves, its slender form and agile wings weave a mesmerizing tapestry of light and motion, its feathers glistening like polished silver in the sunlight. With each effortless glide, it seems to embody the very essence of the ocean's breeze, its cries punctuating the air as it pursues its prey with a fierce and unrelenting passion. In its annual migrations, this diminutive bird undertakes a journey of thousands of miles, a testament to its indomitable spirit and unwavering resolve.
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