I am convinced that the birds round here know when the count is on, and disappear for the duration. This year l am going to try the afternoon rather than the morning to see if that makes a difference. On the morning of Christmas Day, l was struck by how many birds were around, including ones we don't see all that often. Most unusual.
Try multiple times a day for short periods over the three days. I need to as to see my Blue Tits it needs to be about 7am, but the Dunnocks and House Sarrows won't come till 10ish. Robins are twilight either end of the day, except the resident male who sings all day.
The French do a bird count too but on the 27th and 28th. There's been a sharp decline in ordinary garden birds apparently so I shall join in but, going by previous attempts in Belgium, they'll know what i'm up to and be somewhere else on count day so I may cheat.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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My last house, in a town centre, had the occasional woodpecker and fieldfare.