Nice kestrel, Colin. I would love to photograph one.
For birds and sports I prefer a monopod over a tripod.
The monogimbal is a recent acquisition which is much lighter than a standard gimbal, and provides support and freedom of movement.
Thanks Anthony
I agree about the tripod, which I'd mainly use for macro & star shooting
I also own a momopod and i found it useful for sports.
If i took any, it might be useful for water fowl. However my main interest is Birds in Flight
With the 300mm PF and 1.4TC hand holding generally works for me and a monopod would restrict me
I've never had a chance to try the 500mm PF and that might change things!

I first started getting good results with the earlier 300mm f4 AFS
Several of these shots were taken with birds flying above me, or all around me
(see here
https://pbase.com/celidh/birdsofprey)
I tried renting a 300mm f2.8 to see if i could improve results
It was the opposite!
However good the optical quality, the bulk and weight were to much for me to use my previous hand-held technique for more than a few seconds. I took the wimberly and my monopod that day, but came back with few usable shots.
Lots of practice would probably have made a big difference