For small distant targets like that, I would suggest single central focus point, AI Servo and probably spot metering. I would probably use Tv mode at 1/800s and let ISO take care of itself. That's probably it. Success rate will be pretty low anyway, but useful record shots are likely. Good luck.
Good capture of an amazing animal that unfortunately doesn't belong in the UK habitat. Since arriving here (either escaping or being released from fur-farms) they have decimated the water vole population.
As long as the weather sealing is decent, yes it does look pretty darn good. The missus has an 80D and that is already a very capable camera, although I do prefer (have got more used to) the controls on my 7DII.
Looks like at present, the EOS 250D, 5D mkiv and 1DX mkii are the only Canon DSLR with 4K video. They also have 3 EOS M mirrorless bodies with 4K video, including the EOS M50