Willow Warbler vs Eastern Crowned Warbler

In short

The Willow Warbler and Eastern Crowned Warbler can be tricky to differentiate, but the supercilium is a key feature: the Eastern Crowned Warbler has a more prominent and broad supercilium that extends beyond the eye. Additionally, the Eastern Crowned Warbler often shows a faint crown stripe, which is absent in the Willow Warbler.

Identification tips

• Supercilium: Look for the broad, prominent supercilium in Eastern Crowned Warbler.
• Crown stripe: Check for a faint crown stripe in Eastern Crowned Warbler, absent in Willow Warbler.
• Habitat: Consider the habitat; Willow Warblers in open areas, Eastern Crowned in dense forests.
• Song: Listen for the Willow Warbler's descending song, which is distinctive.

Size

Both species are similar in size, typical of small leaf warblers.

Plumage

The Willow Warbler generally has a more uniform olive-green upperpart, while the Eastern Crowned Warbler may show a more contrasting appearance with a distinct crown stripe and brighter supercilium.

Behaviour

Both species exhibit typical warbler behavior, actively foraging in foliage, but specific behavioral differences are not well-documented.

Habitat

Willow Warblers are often found in open woodlands and scrub, while Eastern Crowned Warblers prefer dense, mixed forests, particularly during migration.

Voice

The Willow Warbler's song is a distinctive, descending series of notes, whereas the Eastern Crowned Warbler's song is less well-documented but generally consists of high-pitched, repetitive phrases.