[joking]
Also, I strongly believe that the Andalites stole their shape-shifting technology from the Skrulls (or Chitauri). The Skrulls don't have the two hour time limit. :D Oh wait, Chitauri almost looks like Centaur (replace 'en' with 'hi' and add an i at the end). The Andalites are blue 'Centaurs'. Inconvenience? I think not!!!
[/joking]