I can't tell if those are jpg artifacts around that bee or remnants of digital compositing. I'm thrown off because of the blurring either. It looks like a blur filter, but the fur is either painstakingly masked out, or it's just shot with a really wide aperture (which I have no experience doing). It's just that the feathers in the mouth look *very* blurry compared to the feather below the cat's face that seem to be the same distance away.
I'm going to guess digitally manufactured, but I mainly feel safe in saying that because I think the bee was added later (at least!)
Looking forward to an answer after the challenge!
I guess I'd say it's fake because the chances of getting the cat with it's catch and the bee just seems too much to me but it definitely could happen. Great details on the cats fur