Pretty much everything has been said already; it's an interesting premise and a solid submission. I especially liked the writing for the internal dialogs of each character, because they really make it come alive. I actually feel bad for the wizards, though my normal inclination would be to dismiss them entirely as arrogant fools. Well done!
If Kevin Costner and Morgan Freeman can do it why not a croc?
Solid idea and an amuzing one at that...might be a shark jumper for a campaign though...once the PC realize the GM is open to launching animals at each other as form of warfare things threaten to get all Monty Python on ya.