Manchurian Bush Warbler

The Manchurian bush warbler, also called the Korean bush warbler, is a cettiid first described by Robert Swinhoe in 1860. Current sources may list it as Horornis canturians, while this catalogue follows Horornis borealis; older combinations include Cettia borealis and Cettia canturians. These differing names reflect taxonomic treatment rather than separate field forms, so observers should check which checklist a record follows (Wikipedia, general species account; Avian taxonomic accounts).

The species occupies rich temperate forest, woodland and scrub across eastern Siberia, Mongolia, Korea and northern China, with confirmed breeding in northeastern China. Dense vegetation can make it easier to detect by voice than by sight. The opened account provides broad habitat and range but not dependable Korean measurements, clutch, incubation or diet values, so those are omitted. Korean occurrence is within the documented native range, unlike several vagrant species in the catalogue (Wikipedia, general species account).