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Message: <blockquote data-quote="deborah4" data-source="post: 1274203" data-attributes="member: 29880">Nice collage CAU and highlighting nicely all the points I was trying to make above. (and think I did sort of!)I agree bill is too thin at base for Blackcap and GW which I ruled out on the same basis along with  points made about facial plumage features.Structure can often be the only reliable feature in photos subject as they are to lighting and artifact - so even if we were to ignore the 'caps', illusory or otherwise, and various impressions of our interpretation of colour/tones, so I too, as Bob notes, was troubled a little by the apparently the upward curved culmen on the lower mandible and also the darker tip to the bill (do Marsh/Reed show this at times?).  However, as your thumbnails show, the angle light falls (and angle of shot) can even effect apparent shape giving perhaps if not 'false', at least unreliable impressions of structure.  The bill also appears longer (as well as thinner at base) in the ID bird than I would expect for GW/BCapAs often I find with most Warblers, perhaps features available need to be taken together as a whole rather than relying on just one or two.</blockquote>