Radde's Warbler vs Willow Warbler

In short

Radde's Warbler and Willow Warbler are both small, similar-looking leaf warblers, but they can be distinguished by structural and plumage differences. Radde's Warbler has a more robust build with a shorter primary projection, while Willow Warbler is more slender with a longer primary projection. Both species have a supercilium, but Radde's Warbler's is more pronounced and yellowish.

Identification tips

1. Structure: Look for the more robust build and shorter primary projection of Radde's Warbler. 2. Supercilium: Radde's Warbler has a more pronounced and yellowish supercilium. 3. Plumage: Note the warmer, olive-brown tones of Radde's Warbler compared to the Willow Warbler's greener tones. 4. Song: Listen for the sweet, descending song of the Willow Warbler, which is absent in Radde's Warbler.

Size

Radde's Warbler is slightly more robust and stocky compared to the more slender Willow Warbler.

Plumage

Radde's Warbler has a more pronounced and yellowish supercilium, while Willow Warbler's supercilium is paler. Radde's Warbler also tends to have a warmer, more olive-brown upperpart coloration compared to the more uniform greenish tones of the Willow Warbler.

Behaviour

Both species exhibit typical leaf warbler behavior, actively foraging in foliage, but Radde's Warbler may appear more deliberate in its movements.

Habitat

Radde's Warbler prefers dense undergrowth in open taiga and forest edges, while Willow Warbler is more often found in open woodlands and scrubby areas.

Voice

Willow Warbler has a distinctive, sweet, descending song, while Radde's Warbler's vocalizations are less musical and more chattering.