Cave-trolls

A Cave-troll was a type of Troll which lived in the caves of Middle-earth.

Appearance
Cave-trolls are about 12 to 17 feet tall and have dark greenish skin with blue or grey eyes. The troll's blood is black in color which is very hot and their hides are so tough that if you stab them with a sword, it will bend and will do no damage.

Habits
Cave-trolls are barely intelligent creatures which uses their sense of smell more than sight even though in the movie of the Fellowship they appear to have no nostrils. In combat Cave-trolls usually kill the opponents that foolishly get too close to them. Cave-trolls are omnivores, eating both meat and plants. Usually these trolls live in a groups of goblins and fight alongside them. They are captured and used by both the armies of the goblins and Sauron. It is known that Cave-trolls can turn into stone when exposed to direct sunlight. The cave-trolls can roar, but cannot talk in any languages. Cave-trolls wear loincloths which the trolls either find or are given by the goblins.

Location
Cave-trolls dwell in such places as the hills on the feet of the Misty Mountains or in its caves. The Elves prevent the cave-trolls from getting far in the south so they thrive in places such as the badlands of Ettenmoors or the Troll Fens.

Book and Movie
In the book version of The Fellowship of the Ring there are many cave-trolls. The first cave-troll is fought by Frodo who stabbed its foot, but the troll is not killed. The trolls are described as having long arms, dark green scales and toe-less feet. Soon, two more cave trolls throw two large boulders to form a bridge so the Balrog could pass.

In the Peter Jackson's 2001 movie version, there is one cave-troll which is killed by the Fellowship members who spear and hack at the cave-troll with no avail until Legolas dispatches it with an arrow. The arrow enters the soft part of its mouth and goes straight through the troll's neck, emerging from the back of its head after becoming stuck in the troll's thick skull. In the movie made by Peter Jackson the cave troll is computer animated. Its movements were done by Randall William Cook, wearing a motion-capture suit.