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Yeerks are the primary antagonists of Animorphs novel series. They are a species of slug-like parasites from a planet which having a sun that emit Kandrona rays, light that is their natural food. These small but foul, megalomaniac creatures requires# host bodies to see, walk and verbally communicate. They try to invade Earth by infiltrating its population's society, only to be failed by Animorphs, the titular heroes of the series.

Anyone and anything that they possessed are called Controllers.

Appearance

While not possessing someone, Yeerks' normal form are greatly resembles large slugs with four fin-like limbs and greenish-gray skin. They lack eyes, though they possess optical and sensory tentacles on their head. However, once they enter a host's ear and brain, their body shifts into near-liquid form so they could pass through orifices within ear canal and possesses the host's brain, effectively controlling their body and mind.

Hierarchy

Once they sought for world domination after stealing various resources from Andalites, they formed hierarchy among themselves, which are:

Council of Thirteen

The Council of Thirteen is at the top of the Yeerk hierarchy. One of the members of the Council is the Emperor, but only the Council members know which one. There are a variety of hosts on the Council including Hork-Bajir and Taxxons. There are no humans on the Council, and no Andalites as Visser Three/One was never appointed to the Council.

Visser

Just below the Council of Thirteen are the Vissers, generals of the Yeerk empire. The lower the number the higher ranking the Yeerk, therefore Visser One is the highest, and this goes on down until Visser 47 or so.

Known Vissers: Esplin 9466

Sub-Vissers

Below Vissers are Sub-Vissers. They are the colonels of the Yeerk empire, having subordinates but still taking orders from a superior officer. The same applies to Sub-vissers as Vissers, the lower the number the higher the ranking.

Controllers

The lowest ranking members of the Yeerk empire are the standard controllers. However, there are high ranking controllers such as Chapman, and there are low ranking controllers such as Tom. Serves Yeerk Empire as soldiers, workers, spies, etc.

Notable Controllers: Esplin 9466 Lesser

Navigation

           Animorph-Logo Villains

Yeerks
Council of Thirteen | Akdor 1154 | Edriss 562 | Esplin 9466 | Visser Two | Visser Four | Sub-Visser Fifty-One | Temrash 114 | Iniss 226 | Esplin 9466 Lesser | Aftran 942

Andalites
Unit 0: Arbat-Elivat-Estoni | Aloth-Attamil-Gahar

Higher Powers
Crayak | The Drode | Father | The One

Others
David | Helmacrons | Howlers | Nartec

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