Acrocephalus rufescens
The Greater Swamp Warbler (Acrocephalus rufescens) is a medium-sized, somewhat robust reed warbler, measuring approximately 13-15 cm in length with a wingspan of 18-20 cm and weighing 10-15 grams. Its plumage is primarily a warm rufous-brown on the upperparts, contrasting with buffy-white underparts that may show subtle, faint streaking on the flanks. A distinctive pale supercilium often extends beyond the eye, providing a key field mark amidst its otherwise cryptic appearance, and its long, ...
This species is a highly specialized denizen of dense freshwater wetlands, particularly extensive reedbeds (Phragmites australis) and sedge marshes, typically found in lowlands and river deltas.
Primarily insectivorous, feeding on a wide variety of aquatic and terrestrial invertebrates such as dragonflies, damselflies, mosquitoes, beetles, and spiders, gleaned from vegetation or caught in flight.
The Greater Swamp Warbler is a diurnal species, with males becoming particularly active and vocal during dawn and dusk to defend territories and attract mates. Foraging involves agile gleaning of insects from reed stems and leaves, often hanging upside down, and occasionally short, acrobatic aeri...
The Greater Swamp Warbler breeds across a broad band of temperate Europe and western Asia, with its primary stronghold in the extensive river deltas and large lake systems of Eastern Europe, such as the Danube Delta, and the marshlands of Poland, Hungary, and Russia. Its breeding range extends ea...
Least Concern
- The Greater Swamp Warbler is a master mimic, often incorporating phrases from dozens of other bird species into its incredibly complex and sustained song, making individual identification challenging for new birders. - Despite its drab plumage, its loud and far-carrying song can dominate the so...