Willow Warbler vs Common Chiffchaff

In short

The Willow Warbler and Common Chiffchaff are similar leaf warblers, often confused due to their overlapping ranges and habitats. Key differences include the Willow Warbler's longer primary projection and more pronounced supercilium, while the Chiffchaff's song is a distinctive 'chiff-chaff' repetition.

Identification tips

• Primary Projection: Willow Warbler has a longer primary projection, visible when perched.
• Supercilium: More pronounced in Willow Warbler, especially in fresh plumage.
• Song: Listen for the Willow Warbler's melodic, descending song versus the Chiffchaff's repetitive 'chiff-chaff'.
• Plumage Tone: Willow Warbler is generally brighter and more yellowish.
• Season: Willow Warblers are more migratory, often absent in winter, while Chiffchaffs can be resident or short-distance migrants.

Size

Both species are similar in size, but the Willow Warbler appears slightly more elongated due to its longer wings.

Plumage

Willow Warblers generally have a brighter and more yellowish plumage with a more distinct supercilium, whereas Common Chiffchaffs are duller, often with a more olive-brown tone.

Behaviour

Both species exhibit similar foraging behaviors, often seen flicking through foliage. However, the Chiffchaff may appear more active and restless.

Habitat

Both species inhabit woodlands and scrub, but the Willow Warbler prefers more open woodlands and is more migratory, while the Chiffchaff is more adaptable to various wooded habitats, including gardens.

Voice

The Willow Warbler has a sweet, descending song, while the Common Chiffchaff's song is a repetitive 'chiff-chaff'. Calls are less distinct but the Chiffchaff's is a soft 'hweet'.