Handheld, out the car window, at 1,000mm:
Coyote In Wildflowers by
David Stephens, on Flickr
Sony a9, EF 500mm f/4L IS II, EF 2.0x TC-III, Metabones EF-to-E T Adapter MkV.
Kevin, don't worry, this shot would have been just as good with my 5D MkIV. I almost grabbed it, with the 100-400mm, but I was still in test mode with the a9, working it out at 1000mm. I was lucky that the coyote got far enough away to fit in the frame.
I'm finding that the a9 needs more noise reduction than the 5D MkIV, in many situations. The a9's noise is easy to deal with, but it shows up at ISO 800, or there about.