One of the biggest themes in all of Tolkien’s stories is the dichotomy between good and evil. This is demonstrated not only by the narrative, in which the heroes always beat the villains, but also in the fact that nearly every being and creature in Middle Earth has an evil counterpart.
For every force of good in Tolkien's world, there is a being or creature who shares the same traits and attributes as them, but has been twisted or corrupted into something hateful by the dark forces in the world. They sometimes clash with each other, and other times simply serve as foils to show audiences the differences between what makes right and wrong.
LOTR: Sauron Is Not The 'Lord' Of The Rings, So Who Is?
There are several birds and beasts who involve themselves in the wars for Middle Earth, including the Ravens of the Lonely Mountain, who have long been friends to the dwarves who dwell there. The ravens help to pass messages across the battlefield for Thorin and his company during the Battle of the Five Armies.
In opposition, the Crebain of Dunland are devious, crafty crows who have sided with Saruman due to an old allegiance with the wild-men of the Southlands. They act as spies who report on the comings and goings of the fellowship as they journey towards Mordor to try to destroy Sauron’s ring of power.
Ents are well known for their involvement in the defeat of Isengard, when they helped to take down the white wizard Saruman after he made the mistake of chopping down their trees. These shepherds and herders of the forest are well known for being slow and gentle giants, who never do anything hasty.
On the other hand, their counterparts the Huorns are cruel and deadly creatures. They appear out of the forest in the blink of an eye and
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