One Reason: Sauron.<P>My guess is that Sauron has some kind of protective girdle around Mordor, that kept everyone out. Remember that he places shadows upon his realm for his protection. If an eagle wanted to do such a task, not only would the eagle have to overcome the power of Sauron protecting the land (infinite shadow, heat, the Will of Sauron against you and a fat chance to get alive to Mt. Doom... thanks to all the lava, heat, smoke, etc), but the Nazgul on their winged beasts and the orc's arrows.<P>Maybe the fell beasts could not do much by themselves, but the cries of the Nazgul scared everyone, including animals.
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"In place of a Dark Lord you will have a Queen! Not dark but beatiful and terrible as the Dawn! Treacherous as the sea! Stronger than the foundations of the Earth! All shall love me and despair!"
--- Galadriel when tempted by the One Ring.
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