Arctic Warbler vs Cetti's Warbler

In short

The Arctic Warbler and Cetti's Warbler are both small, elusive warblers but differ significantly in appearance and habitat preference. The Arctic Warbler is typically found in open, northern habitats, whereas Cetti's Warbler prefers dense, shrubby areas. Key field marks include the Arctic Warbler's distinct supercilium and the Cetti's Warbler's rich brown plumage.

Identification tips

1. Look for the pale supercilium on the Arctic Warbler, absent in Cetti's Warbler. 2. Note the olive-green upperparts of the Arctic Warbler compared to the uniform brown of Cetti's Warbler. 3. Listen for the loud, explosive song of Cetti's Warbler, especially in dense vegetation. 4. Consider habitat: Arctic Warblers are found in open, northern areas, while Cetti's Warblers are in dense, shrubby environments.

Size

Both species are small warblers, but the Arctic Warbler is slightly larger and more slender than the compact Cetti's Warbler.

Plumage

The Arctic Warbler has a prominent pale supercilium and a generally olive-green upperpart, while Cetti's Warbler is uniformly rich brown with a less distinct supercilium.

Behaviour

Arctic Warblers are more likely to be seen actively foraging in the open, whereas Cetti's Warblers tend to skulk in dense vegetation and are more often heard than seen.

Habitat

Arctic Warblers inhabit open woodlands and tundra regions, particularly in northern areas, while Cetti's Warblers prefer dense, shrubby habitats, often near water.

Voice

Cetti's Warbler is known for its loud, explosive song, often heard from dense cover. The Arctic Warbler's song is more melodic and less powerful.