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You are through to Dr Coles. I am a UK based vet. I am sorry to hear you are having problems with this crow. Is this a wild crow? Are the feathers white and brittle? are the other feathers normal? Is the crow eating ok and what are you feeding him on?
It is actually an offence to keep wild animals caged in captivity (even though I understand you are trying to help him) unless you are a wildlife rehab or a vet providing treatment. Have you considered trying to find a wildlife rescue that could take him? Nutritional issues are common in crows. Sometimes fledgelings will be abandoned by their parents if they have any underlying disease. This may be why you found him when he was a chick. We often see white brittle feathers and loss of feathers with crows who have nutritional deficiencies and skeletal abnormalities. I would advise ensuring you are feeding him on a balanced diet and making sure you have read up about the diet of corvids. I would also advise supplementing him three times weekly with a vitamin supplement such as avipro avian. However it would be best to find a wildlife rehabilitation so that he can be examined and possibly gradually released back into the wild or even kept in a large aviary rather than a cage.