Use prime lenses lah! Even better! haha!!
Decent collection of pictures you got there. I am not into nature photography, but I had the good chance to rub shoulders with a couple of top nature photographers. A lot of them favor primes, and it is interesting that you include the 80-400mm in your arsenal. Why not just stick to the 200-400mm?
The answer is very simple, just look at the size of the lens - u wont be able to bring a 200-400 everywhere u go.
zoom has its advantages, quality though not as good as primes, but its acceptable..