An alien parasite, the villians of the Animorph series, written by K.A. Applegate. They closely resemble large earth slugs and are grayish-green in color. They enter the brain through the ear canal and take over the host body completely. Beings taken over in this manner are known as Controllers. The Andalites have been their sworn enemies for more than 39 earth years.
Andalite: "Yeerk filth!"
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