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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I will review your question and get back to you ASAP with a response
Thank you for having concern about this crow in your garden. Firstly can it fly at all or is it's flight just limited?
Ok, it does sound like there has been some type of developmental defect here, may an issue with the flight feather development. However that fact that he has survived so long means that he must have adequate flight in order to find food and feed himself, especially over the winter. Unfortunately crows like many other birds will fight for territory and in some cases actually kill each other, it is one of the cruelties of nature sadly. As your crow is obviously weaker then he will be a natural target for others who wish to take over the area.
There are two main ways to consider the situation
1.) It is nature/survival of the fittest, sadly your crow was not really meant to survive and whilst it may be distressing to watch it happens in nature every day.
2.) We can try intervene help the crow if possible, if we choose this option it would involve capturing him and taking him to a vet or other wildlife rehabilitation centre. However from the sounds of it, his problem will not be easily fixed and he may never be able to be released into the wild again. This would mean a life of captivity - something that most rescue organisations will oppose for a wild bird, thus it would probably result in him being put to sleep, however this would prevent him being injured or killed by other crows.
I'm sorry not to be able to paint a happier picture, but that is the best advise I can give you. If you have any follow up questions then please let me know.