Willow Warbler vs Cetti's Warbler

In short

The Willow Warbler and Cetti's Warbler can be distinguished primarily by their habitat and vocalizations. Willow Warblers are typically found in open woodlands and have a more slender appearance with a longer primary projection, while Cetti's Warblers prefer dense undergrowth near water and have a more robust build with a shorter tail.

Identification tips

1. Look for Willow Warblers in open woodlands and Cetti's Warblers in dense, wet habitats. 2. Note the Willow Warbler's longer primary projection and yellowish supercilium. 3. Listen for the Willow Warbler's soft, melodic song versus the Cetti's Warbler's loud, explosive song.

Size

Willow Warbler is slightly smaller and more slender than Cetti's Warbler.

Plumage

Willow Warbler has a more uniform olive-green upperpart and pale underparts with a distinct yellowish supercilium. Cetti's Warbler is more uniformly brown with a less conspicuous supercilium and a richer, rufous-brown tail.

Behaviour

Willow Warblers are more likely to be seen flitting actively in open areas, while Cetti's Warblers are skulking and often remain hidden in dense vegetation.

Habitat

Willow Warblers are found in open woodlands, parks, and gardens, whereas Cetti's Warblers prefer dense, wet habitats like reedbeds and riverside thickets.

Voice

Willow Warbler has a soft, melodic song, while Cetti's Warbler is known for its loud, explosive song.