So how do you think they should handle Ookla's alien mount? (I'm sure the species has a name, I think Ariel mentioned it in one episode, but I don't remember what it was). Here's how I see it...
1) Every time Ookla monts the animal, both mount and rider are done in CGI. I know a lot of George Lucas fans out there would probably think this a great idea, but I disagree. The trick to using CGI is "Less is more". That's why The Fellowship Of The Ring, The Two Towers, and The Return Of The King were so much better than The Franchise Menace, Attack Of The Clowns, and Revenge Of The S#!t.
2) Use animatronic mounts for close ups of Ookla mounting, sitting on, and riding the creature, then switch to CGI for wide angle shots of Ookla and the others riding their mounts. This is what was done in the Jurassic Park and The Lord Of The Rings trilogies. I prefer this method to the first one.
3) Buy a baby draft horse, have it raised and trained as a mount. Then when it's full grown and ready to be ridden, fit it with a specially made Motion Capture Animation suit (like what Andy Serkis wore in The Lord Of The Rings when he played Gollum). Then whoever is playing Ookla will mount and ride him as written in the script. The computer geeks can then use the information captured by the suit to animate and fill in the creatures movements. This will keep everything looking natural and as real as possible.
4) A combination of #2 and #3, using the animatronic mounts for close ups and the MCA trained draft horse for wide angle shots. I like this plan best, as it helps keep the mount looking as real as possible at all times.