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I hadn't realised these were any different from house sparrows until I watched Chris Packham's Nature's Calendar prog the other day. Is their distinctive characteristic the chocolate brown cap? whereas in house sparrows this is grey?
Tree Sparrow sexes are alike, so chocolate brown cap is a good ID feature in the UK.
I find the black 'cheek patch' a useful ID feature.
Lat/Lng: 51.5, -1.8
OS grid ref: SU2080