Tried Animal face/eye detection AF (ver. 3.00) on my Z7 --- worked pretty well. Pattern recognition technology is amazing. I used Hi-speed continuous mode, Z24-70mm f/4 at wide-open, at 70mm, basic, jpeg. Cats can be anywhere in the frame, and the eye-detection algorithm finds and follows the cat's eye quite accurately even when the cats are moving. In the past, a photographer specializing in pet photography spent half a day shooting hundreds of shots to get one photo in sharp focus. I just spent 5 minutes firing 20 shots, lens wide open, and a few shots came out good. What an amazing technology!