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Willow Warbler Phylloscopus trochilus L 11cm. Similar to Chiffchaff but separable using subtle plumage details, colour and voice. Sexes are similar. Adult has olive-green upperparts, yellow throat, whitish underparts and pale supercilium. Overall, plumage is brighter than Chiffchaff and primary feathers project further. Note pale supercilium and pinkish yellow legs. Juvenile is similar but paler and more yellow, particularly on underparts. Voice hueet call is similar to Chiffchaff. Song is a tinkling, descending phrase that ends in a flourish. Status Widespread and common summer visitor to wooded habitats including birch woodland and willow scrub.