Willow Warbler vs Scrub Warbler

In short

The Willow Warbler and Scrub Warbler are easily confused due to their similar size and subtle plumage differences. The most reliable field mark is habitat: Willow Warblers prefer wooded areas, while Scrub Warblers are found in arid, open scrublands. Additionally, the Willow Warbler has a longer primary projection and a more pronounced supercilium.

Identification tips

1. Check habitat: Willow Warblers are in wooded areas; Scrub Warblers in arid scrub. 2. Look for supercilium: More pronounced in Willow Warbler. 3. Observe behavior: Willow Warblers flit in trees; Scrub Warblers stay low in bushes. 4. Listen for song: Melodious in Willow Warbler; harsh in Scrub Warbler.

Size

Both species are small, but the Willow Warbler is slightly larger with a more elongated appearance due to its longer wings.

Plumage

Willow Warblers have a more pronounced supercilium and a generally greener upperpart, while Scrub Warblers are more uniformly brown and lack the strong supercilium.

Behaviour

Willow Warblers are more likely to be seen flitting through trees, while Scrub Warblers often stay low, moving through bushes and undergrowth.

Habitat

Willow Warblers inhabit wooded areas, including forests and gardens, whereas Scrub Warblers are found in arid, open scrublands and deserts.

Voice

Willow Warblers have a distinctive, melodious song, while Scrub Warblers produce a series of harsh, chattering notes. Listening for these differences can be helpful in identification.