The previous image I posted of this same bird was taken with a 100-500 mm lens at f/7.1 (wide open for this lens). The bird was about 5-6 meters away from me.
This second image is the same bird on a different perch, but was taken with a 600 mm f/4.0 lens at f/5.6. Virtually the same background. Bird was only slightly more distant; about 6-7 meters.
Background looks totally different.
Small amount of canvas added at bottom to give tail a little more room. Bird brightened slightly and BG darkened slightly. Beak brought down slightly.
Shot with an R5; SS 1/400, ISO 4000, f/5.6, EC -0.3. Processed with DXO PR, PS, DeNoise AI.