Two types of lenses were used. A Sigma 150-600mm C or a Canon 70-300mm L. A Canon EF-RF converter was used. See if you can tell which lens was used.
Most photos were taken with the camera handheld. Some on a monopod. A couple on a tripod.
I am an exceedingly lazy photographer. For gloomy to bright days, I used Program mode. For very bright sunny days I used Tv mode. I don't fiddle with anything else, apart from choosing which focus area to use - normally point, small square, nine-point or full frame.
One set of Kingfisher shots were taking while experimenting with RAW burst - well CRAW burst really, as I needed to compress the output.
Minimal postprocessing was done in FastStone. No de-noising or sharpening software was used; apart from the limited sharpening in FastStone.
Playing about with CRAW burst for most of these Kingfisher shots. The bridge is about 100m from me. I used a Canon 1.4 extender for a couple of these, with mixed results.