Carrion Crow with white and grey wing feathers
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Pied. Leucistic is a pale buff colour this is just pied, Common in Black birds. Crows are not entirly black either and can show grey in the primaries esp after moult
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Leucism is the effect of a problem with the deposition of pigments which results in abnormal pale, or white, colouration. This means that pied crows (and Blackbirds) are leucistic.
Normally Carrion Crows should be black, if they have grey or white patches in their wings after a moult it is due to a problem with the deposition of pigment (ie. leucism).
A summary about albinism/leucism can be found here;
Thanks,BecclesNature. That hadn't occurred to me.
Leucism is actually the reduction or absence of all pigments, so the birds is partially leucistic, but as it has only melanin pigments, it is also albino (which does not mean entirely white, merely reduced melanin).
White feathers in crows is common and usually temporary - it is often due to dietary problems and/or stress. In years when spring is dry, young rooks, which are normally reared largely on earthworms and other soil invertebrates, commonly have white or grey flight feathers in particular.
Lat/Lng: 52.0, -0.8
OS grid ref: SP8837