With the greening over comes the Willow Warbler, now joining the Blackcap and his near-identical relative the Chiffchaff. Telling the difference is a problem unless you actually see them singing. The other way is to get a good look at their legs, the Chiffchaff's being black and the Willow Warbler's paler. So all you have to do is persuade your bird to come close enough and stay still while you stare.
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