You've used the ordinary tracking on the 1dx that works great but is no animal eye detection. I've used the tracking on bigger birds in flight and the focus follows the bird but switches often to the whole body or wings and doesn't stay on the bird....
I completely agree with you Jens. When the R5 came out this was the first thing I was wondering. I own the 1dmMIII for a few months now and it's a beast. It's a fantastic camera for wildlife. The tracking at Live View is good but it is only tracking ...