Reek

The reek, are fictional beasts with three horns and similar to rhinos, which appear in the movie Attack of the Clones, Episode II of the film series of the Star Wars.

The reek was a huge bullfighting beast with armored skin. It is native to the moon Codian, where they graze peacefully on extensive ranches. But being fed meat, they become very aggressive and often attack anyone who gets in their way. Such is the metabolic change that its greenish skin turns reddish, manifesting the change in its diet.

The reek were traded by a few, such was the case of the Geonosians, who bought a group of these beasts and took them to their Arena of Geonosis, where they executed the prisoners, throwing them to the reek or other beasts.

Obi-Wan Kenobi thinks a reek is strong, but stupid.