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Thanks Jane and Fifebirder for your replies so far. We are trying to identify a bird seen earlier this year, and are wading through lots of information on all the possible chiffchaff subspecies/species. During our research, we have heard that a Mountain Chiffchaff has apparently been...

I am looking into the identification of Mountain Chiffchaff , of the Caucasian race lorenzii, away from it's normal range. Apart from differences in plumage and call, has anybody noticed in particular, a difference in jizz or movement between lorenzii and collybita. For example, is the...