In the film there were around 200,000 - 600,000 orcs
in the book there was no real figue but according to the characters in the book it was an army with a size beyond comprehension. So i guess the films were about right.
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There are many orcs in The Hobbit. The main antagonist amongst the orcs, however, is Azog the White Orc, who killed Thorin's father.No but jackson has him in the movie anyway it sucks
There are men, elves, dwarves, hobbits, orcs, and many other species, if that is what you're asking.
J.R.R. Tolkien was the one who originally created orcs, yes. Although they also appeared in some of his other Middle Earth-related books, mainly The Hobbit, which is the prequel to The Lord of the Rings trilogy.
There are a number of unpleasant characters in Lord of the Rings, such as Denethor, Grima Wormtongue, Gollum, orcs, wargs, and the black riders (Nazgul) but the two 'villians' are The Dark Lord Sauron and Saruman the Wizard.
Lurtz was the leader of the Uruk-hai .