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Message: <blockquote data-quote="dantheman" data-source="post: 1718197" data-attributes="member: 32998">So, rather 'Interesting'... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />In favour of 2 birds; 5 'birders'In favour of 1 bird; 4 'birders'(Taking the OP + wife and Fugl (assuming Nevada not part of the British Isles?) out of the equation)So, amongst UK birders responding (not sure that all actually did the survey?), over 50% did/would get the wrong results for sexually dimorphic garden birds, thus over recording them!!!!In the x years the survey has been running, are the RSPB aware of this? Should we be seeing different results?  (Another possible major source of error -wonder if any/many people would have totted up the total number of species seen in their gardens over the hour?? Certainly on the other threads there are some pretty impressive gardens for birds out there, or is it just lots of feeding at the time?? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> )Can't say if I would have made the mistake or not as I have not done it myself, although I was 'identification assistant' earlier when my GF did her hour ... ( :-O )</blockquote>