You shot through a fence by the looks of it. Can't be helped a lot of the time, but if there's any chance you can try to find a darker part and align it so you're centred on a hole and not the wire itself. If you wanted to spend more time, it could be possible to manually even out the lightness from the fence. The relatively strong colour may be making that show up more, and personally I'd prefer a more neutral look to wildlife shots.
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