Willow Warbler (Phylloscopus trochilus) lives in temperate woodland across Europe, Western Asia, Northwest Africa. Its conservation status is Least Concern.
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A real field recording of the Willow Warbler, made in the wild.
The Siberian subspecies undertakes a monumental trek of up to 12,000 km each year, flying from eastern Siberia to southern Africa along the Asian-East African Flyway, which is among the longest migrations recorded for a bird of its modest size. It arrives on the breeding grounds in mid-March and remains there until mid-May, then breeds from late April through August.
In Scandinavia the willow warbler reaches its highest densities, with up to 1,100 breeding pairs per square kilometre and a total of 24 million pairs across Sweden and Finland, making it the commonest bird there. Moving eastward the numbers fall sharply, with the peak density in central Siberia only 27 pairs per square kilometre.
A non-singing willow warbler can be set apart from the similar chiffchaff by its pale pink-yellow legs, a longer pale bill and a more elegant overall shape, as well as a longer primary projection at the wingtip. These subtle field marks are reliable for identification when the bird is silent. Its vocalisation is a simple, repetitive descending whistle, contrasting with the chiffchaff's more monotone call, providing another clue for observers.
In northern Europe the willow warbler is among the first warblers to return each spring, arriving before most other species but still after its close relative the chiffchaff. It reaches the breeding range in mid-March and stays until mid-May, with the main breeding period beginning in late April. This early arrival allows it to secure the preferred birch, alder and willow habitats needed for nesting before competition intensifies.
Willow warblers are highly migratory, wintering across sub-Saharan Africa before undertaking long journeys back to Europe, yet only a few individuals have ever been recorded in Alaska. Those rare sightings have all been on St. Lawrence Island, highlighting how unusual it is for this normally Eurasian species to appear so far west.
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As the sun rises over the lush woodland, a tiny, agile form flits through the underbrush, the Willow Warbler's bright, inquisitive eyes scanning the dense foliage for the slightest hint of movement. With a gentle, lilting song, it dances through the trees, its delicate wings beating at a furious pace as it pursues the abundant insects that fuel its incredible migratory journeys. In a whirlwind of olive-green and yellow, this unassuming bird embodies the very essence of spring, its carefree spirit and boundless energy a testament to the resilience and beauty of the natural world.
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