Questions tagged [yeerks]

The Yeerks are a parasitic alien species and the chief antagonists of the Animorphs young adult book series. Yeerks resemble slugs and have the ability to control a human, animal, or alien by slithering into its ear canal and attaching to its brain. An individual controlled by a Yeerk is called a Controller.

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How could Karen go free?

Due to her interaction with Cassie, Aftran decided to let her host, Karen, go free. Near the end of #19 The Departure, Aftran is inside Karen's head, in the woods, talking to Jake. Karen's body is ...
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Did any Yeerks other than Illim and Aftran know who the Animorphs were?

In #29 The Sickness, the Yeerk Illim tells Cassie: I know your friend is an Andalite,” (...) “I also know who you are and what you are. All of you,” Thankfully for the Animorphs, Illim is a ...
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How did the Yeerk Peace Movement manage to keep secrets from Visser Three?

In #29 The Sickness, Visser Three plans to interrogate Aftran. <You will tell me everything about the so-called peace movement,> Visser Three told Aftran, blasting his thought-speak loud ...
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What happens if a Yeerk infests someone in morph and then demorphs?

We know that it's possible for Yeerks to infest individuals while in morph. In The Hork Bajir Chronicles, a Yeerk called Esplin manages to temporarily infest an Andalite while the Andalite is in morph:...
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Why would Tom's Yeerk have to torture Cassie?

In #53 The Answer, Tom's Yeerk brings what he thinks is a bludgeoned and beaten Cassie (not in morph) to Visser One. He then says: One of the Animorphs, Visser. My people captured her and ...
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What happened to the Yeerks after the war?

In the last Animorphs book, after the Andalites captured the Pool Ship, the Yeerks didn't stand much of a chance against the Andalites. So some ships fought and were destroyed, others surrendered. At ...
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Can Yeerks communicate with each other when they're in the Yeerk pool?

How about back home in the natural pools of their homeworld? If yes, how do they communicate?
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What are the limitations for what species Yeerks can take as hosts?

I know from the Yeerks' experiences with the Hawjabran that the Yeerks can only take as hosts species that have a central, unified nervous system. But are there any other limitations? Does the ...
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Which non-human Earthlings did the Yeerks try to take as hosts?

Just like the Animorphs, the Yeerks could have probably benefited from a dog's sense of smell, or an eagle's sight, in certain circumstances. Did the Yeerks ever try to take any species (from Earth), ...
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How did the Yeerks help the Gedds survive?

The Animorphs Wiki states that Because they are slow and inefficient, the Gedds formed a symbiotic relationship with the Yeerks, who helped them survive in exchange for being hosts. How exactly ...
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Who was the first non-Gedd to be taken by a Yeerk as a host?

I know that the original host species of the parasitic Yeerks was the Gedd species. Who was the first non-Gedd individual to be taken by a Yeerk? How did it happen? Was it before or after Seerow's ...