I got in the 60-600 finally! Strange that I had to buy used after waiting for 6 months, and there still aren't any in the US a month after they expected to be restocked. Our supply chains are so broke right now and not getting better that I gave up on ever getting a new sigma 60-600 in Nikon mount.
@koalagardens Right? I have discovered whenever you think of a shot similar to this, the zoom used is between 900-1200 FF equivalent, never a 200-300 like people always suggest as enough "zoom" a 200-300 is good to capture a human portrait from across a small room, not a bird or squirrel from a distance they are willing to let you approach.