I also thought it was shot through a window or possibly the lens fogged up. There is a bad haze that is not present in the other images. I would recommend getting closer too, a lot closer. There is no feather detail in the bird and the image is quite soft. Unfortunately, you cannot fix those issues in post processing, but I was able to remove the haze with dehaze slider in lightroom. Do you have the camera settings for this particular image (focal length in mm, shutter speed, f-stop, ISO)? Usually, you can right click on the original image and it will say in the details...
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