I am guessing your not in the UK as it ain't a bird I am familiar with unless it's an escapee.
Post edit
A Google lens search suggests Raven...could be a very bedraggled one but I shall leave it to the experts
(Pardon the Scottish Accent)
Yes I am in norfolk uk
I just done a post edit Mandy as you can see above
Thank you
This looks like a crow that has been scalped, possibly by a predator.