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Message: <blockquote data-quote="MTem" data-source="post: 3229438" data-attributes="member: 107707">Apparently it has been recorded before, but a new one for me. I thought it worth reporting because of the widely definitive use of song to separate these two.At Pulborough Brooks RSPB reserve on Thursday I heard what I initialling took for a Chiffchaff and Willow warbler singing from the same tree at the same time, but soon it became obvious it was just one bird. It would start with the characteristic quiet cheep-cheep-cheep followed by the start of zlip-zlap of a Chiffchaff and then smoothly transition into the characteristic descending Willow warbler song. It repeated this several times, interspersed with the normal WW song without the CC intro. Took a couple of photos, and it looks to be a WW. Long wings, pale legs etc.BWP Vol IV records that 'songs mixed with those of P. collybita are widely reported'. Singers are usually P. trochilus, but some were established hybrids. Anyone see anything to suggest this might be a hybrid? Must admit I can't.Mick</blockquote>