The Great Eagles, are immense, sapient birds that can speak. They appear throughout Tolkien's legendarium from the First Age through the Third Age, serving as powerful allies and messengers. They are closely associated with Manwë, the ruler of the sky and leader of the Valar, and are often seen as agents of divine grace or eucatastrophe—the concept of a joyous, happy ending.
The Eagles were sent to Middle-earth by Manwë to serve as his spies, messengers, and protectors of the natural order.
They have great size and strength, with Thorondor being the mightiest among them, with a wingspan of about 180 feet.
Unlike simple animals, Tolkien's Eagles are portrayed as original characters with personalities, agency, and history, not merely birds.
The Eagles symbolize an ancient, magical time in Middle-earth when such beings were more active.
Their presence represents eucatastrophe, the sudden joyous turn in Tolkien’s storytelling.
Eagles' role is somewhat between the fully sentient Elves and the malevolent Orcs, aligned with forces of good but independent.
No, they coudnt use the Eagles to destroy the one ring, and here is why. The Eagles arent just animals, they are contious and can be corrupted by the ring as much as any other being, they also arent servants, and thirdly even if they agreed to it and woudnt be corrupted by the ring, Sauron would see them from miles away, and they woudnt even come near the black gate.