Lord of the Eagles
The Eagles were immense flying birds that were sapient and could speak. Often emphatically referred to as the Great Eagles, they appear, usually and intentionally serving as agents of deus ex machina (or eucatastrophe), in various parts of his legendarium, from The Silmarillion and the accounts of Númenor to The Hobbit and The Lord of the Rings.
These creatures are usually assumed to have been similar to actual eagles (for example, as an independent species of the subfamily Buteoninae), but much larger. In The Silmarillion, Thorondor is said to have been the greatest of them and of all birds, with a wingspan of 30 fathoms (180 ft or 60 m). Elsewhere, the eagles have varied in nature and size both within Tolkien’s writings and in later visualizations and films.