I did not realize that I had asked this question before. I am sorry to have wasted your time.
dan

Why should I switch from my Nikon D800/D500 to a Z9?
What will I gain?

Thanks
I will wait. I do wonder there are other benefits that I would get with a mirrorless over a DLSR.

Wondering after reading some of Steve Perry's ebook on BIF whether I need a mirrorless body.

Can I get by with a new/used D850 if I do not shoot much BIF?

How much better will my other animals show up with a new Z9? I understand eye detection is great but with bison, lions, etc finding and keeping the eye in focus is really not that difficult.

I guess what I am asking : is going to a mirrorless body going to make a $4000+ difference? Since my wife and I use Nikon bodies I am guessing that a Z9 for me would save me money as I can use my old lenses. I had thought about moving to Sony a1 and their 200-600. But then all my other lenses and bodies would just sit around.

Don't forget PayBoo at B/H saves on tax

Taken outside of Cody, WY last December.

Ideas?

I shoot most animals and lots of birds- many in flight.

My wife and I shoot Nikon . She has a Nikon 7100 and uses the 18-300 for her trips and family photos. I have a 7000 that sits in the car for stuff that you just see. I also have a 800 and 500 bodies. We have a 70-200 2.8, 200-500, 500 pf and 500 f4.
Seems like a lot of glass and bodies to make the switch.
Looking for better eye focus and saving weight too.

Love my Nikon 500 pf but use the Nikon 200-500 more

Anyone using something other than the terrible hood that comes with the lens?

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nice

Thank you for your wonderful thoughtful advice. Steve Perry said recently that you need to be able to point out what you are missing and what a mirrorless would do to make you a better photographer. Not sure I can do that now. So I wait. He also said that waiters [is that a word?]- will only have more choices as time goes on.

I currently shoot with either a D500 or D800.

I am not moving at this time but wondering what would be a good camera to start with. $$ is a consideration so no a1. I am most interested in animals and birds in flight.