Acrocephalus bistrigiceps
The Black-browed Reed Warbler (*Acrocephalus bistrigiceps*) is a diminutive and often elusive songbird, typically measuring 13-14 cm in length, with a wingspan of 17-19 cm and a modest weight of 8-12 grams. Its most defining characteristic, and the origin of its common name, is a prominent black lateral crown stripe that stands in stark contrast to a broad, bright whitish supercilium and a dark eyestripe. The upperparts are a uniform warm reddish-brown, devoid of streaking, while the underpar...
This warbler predominantly inhabits dense, low-lying freshwater wetlands, favoring extensive reed beds, sedge marshes, tall grasslands, and thick scrub bordering rivers and lakes, typically at low elevations.
Primarily insectivorous, its diet consists mainly of small insects such as beetles, flies, mosquitoes, insect larvae, small moths, and spiders, which it gleans from dense vegetation.
The Black-browed Reed Warbler is an inherently skulking and reclusive species, spending most of its diurnal activity period foraging deep within dense vegetation, making auditory detection more common than visual observation. It employs a gleaning foraging strategy, picking insects from the stems...
The Black-browed Reed Warbler's breeding range spans across temperate East Asia, extending from southeastern Siberia (specifically the Amur River basin) through northeastern China (including Heilongjiang, Jilin, and Liaoning provinces), the entirety of the Korean Peninsula, and across northern an...
Least Concern
- The "black brow" that gives this warbler its name is technically a prominent black lateral crown stripe, a crucial field mark. - Despite its widespread distribution, its extremely skulking nature means it is far more often heard than seen by birders. - This species is a long-distance migrant, u...