Lanceolated Warbler vs Spotted Bush Warbler

The Lanceolated Warbler is the smallest and most heavily marked of the Locustella warblers, with distinctive olive-brown plumage and blackish streaks. In contrast, the Spotted Bush Warbler's identification details are less defined, making the Lanceolated Warbler's heavy streaking a key field mark.

Look for the Lanceolated Warbler's heavy blackish streaking on the olive-brown plumage, especially on the rump and uppertail-coverts, and its narrow whitish supercilium. These features are key to distinguishing it from the Spotted Bush Warbler.

Both species are similar in size, measuring 12–13.5 cm and weighing 9–13 g.

The Lanceolated Warbler has olive-brown plumage with broad blackish streaks extending to the rump and uppertail-coverts, and a narrow whitish supercilium. The Spotted Bush Warbler's plumage details are not specified, but the heavy streaking of the Lanceolated Warbler is a distinguishing feature.