We had a little visitor come into the yard via the telephone lines. This juvenile tree squirrel was fairly social and kept coming back for popcorn I put on the wall for him and any other interlopers.
Z9 and 800mm PF with 2x teleconverter, shooting in DX mode hand held.
Firmware 5.0 AF was spot on.
Photo 1: ~30' distance and 20' up on telephone lines. Photo 2 & 3 ~25' distance @ head level (6' block wall).