An leucistic house sparrow
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I learnt on iSpot earlier this year that this 'partial albinism' is actually called leucism. Have a look at this link for the definition and some great examples:
I doubt the leg ring number could be read in the field, but whether the ringer could be found and the identity discovered that way? It can't be that common to ring a leucistic bird.
This is an interesting colouration, it has kept its primaries only. Even the bill is 'washed out'. Contact the BTO (bto.org.uk) and see if they can find the ringing record.
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Lat/Lng: 59.9, -1.4
OS grid ref: HU3717