Comment Re:Plot Hole (Score 2) 179
The better answer, from the full lore, is: union rules. The Ents and the Eagles were created to watch over flora and fauna, respectively, mostly to protect them from man. The Wizards were created to watch over man. These duties were handed down directly from the god of Tolkien's world (who's name escapes me). It simply wouldn't be right for Gandalf to ask the Eagles to do his own damn job for him.
Rescuing Gandalf personally, that's a favor to a coworker "sure, I'll give you a ride to work - pick you up where? A tower? OK, that's convenient, thanks."
But of course all of that is based on stuff from the Silmarillion - none of it is in the actual LOTR story, so it's no more canon than Mordor having emplaced 88s protecting Mt Doom.