Hi, Simon - welcome to a great group!
You have posted a couple of interesting images. In the Nikon Z6, eye/face detection only works with the “Auto-area AF mode” , and you’ll probably want that mode if you’re trying to focus on birds. You didn’t mention what lens you’re using, but for birds you’ll need a fairly long and fast lens to be close enough for the tracking to catch hold of the eye.
Looking forward to your images andparticipation in the critiques and discussions!
These are bird images, so should go in the “Avian” category.
I am using a 70-300mm Nikkor for my Z6. Although I have played around with Auto Area AF, it cannot seem to track any birds for me, but it does work exceptionally well on humans. Maybe I am doing something wrong.
Thanks for mentioning the avian section I will keep that in mind for my next posts.