I did manage to get myself a 1.4x Teleconverter to use with my 200-400, though, giving me pretty close to 550mm equivalent, which is really super nice to be able to use on a Full Frame camera like my D4. So all of these photos were taken with either my D4+200-400+1.4x TC or my D3s with my 70-200.
Carrying on:
Also Prairie Dogs!
Kevin Fedde
Fedde Studios