Willow warbler (Phylloscopus trochilus)

Willow warbler (Phylloscopus trochilus)

Observation - Willow warbler (Phylloscopus trochilus) - Global. Description: How do you tell the difference between a wood warbler, a willow warbler and a chiffchaff?

How do you tell the difference between a wood warbler, a willow warbler and a chiffchaff?