Just a word of caution. There were actually two Great Tits making that call to each other. Tit identification by call back to square one (at least for me)?
I think that I’d just accept a certain (very small) amount of error. The things you hear making blue tit noises are still going to be blue tits the vast majority of the time.How does one go about it in the field though--accept a certain error rate or check every bird? I think I'd rather do the latter, but--then--I don't want to purge my checklists from (almost) all now-unconfirmed Blue Tit records.
EDIT: Done. Makes me appreciate the beauty of Blue Tits all the more now that they can't be taken for granted.
Maybe over reliance on Merlin? Cut use of the app and more on field birding? Only note birds you are confident with/backed up by sighting - fairly soon error rate will decline as experience in the field increases.How does one go about it in the field though?