Western Bonelli's Warbler vs Common Chiffchaff

In short

Western Bonelli's Warbler and Common Chiffchaff are similar leaf-warblers, but Western Bonelli's is distinguished by its brighter green edgings on wings and tail, and a more contrasting bright green rump. Common Chiffchaff has a more uniform brownish appearance and a distinctive 'chiff-chaff' song.

Identification tips

• Bright green rump and wing edges: Look for these on Western Bonelli's Warbler, absent in Common Chiffchaff.
• Uniform brownish appearance: Common Chiffchaff lacks the contrasting green highlights of Western Bonelli's.
• Song: Listen for the 'chiff-chaff' of the Common Chiffchaff versus the descending trill of Western Bonelli's.
• Leg color: Western Bonelli's often has paler legs compared to the darker legs of Common Chiffchaff.

Size

Both species are similar in size, around 11.5 cm in length.

Plumage

Western Bonelli's Warbler has a bright greenish-yellow rump and wing edges, contrasting with its pale grey-brown upperparts and silky white underparts. Common Chiffchaff is more uniformly brownish with less contrast, lacking the bright green highlights.

Behaviour

Both species are active foragers, often seen in trees and bushes, but Western Bonelli's may show a bright yellow patch at the bend of the wing.

Habitat

Western Bonelli's Warbler prefers open woodlands and scrub, while Common Chiffchaff is more adaptable, found in forests, gardens, and marshes.

Voice

Western Bonelli's Warbler has a descending trill, while Common Chiffchaff's song is a repetitive 'chiff-chaff' sound. Calls also differ, with Western Bonelli's being more nasal and weaker.