Lerdethak
Encyclopedia
The Lerdethak is a fictional creature from the Animorphs
Animorphs
Animorphs is an English language science fiction series of young adult books written by K. A. Applegate and published by Scholastic. Five humans, Jake, Marco, Cassie, Rachel, and Tobias, and one alien, Aximili-Esgarrouth-Isthill , obtain the ability to morph into any animal they touch. They name...

book series, specifically Animorphs #11: The Forgotten
The Forgotten (Animorphs)
The Forgotten is the eleventh book in the Animorphs series, written by K.A. Applegate. It is narrated by Jake.-Plot summary:Jake spends a day having strange flashbacks of himself in a rainforest, which leaves him disturbed....

 and The Hork-Bajir Chronicles
The Hork-Bajir Chronicles
The Hork-Bajir Chronicles is the second companion book to the Animorphs series, written by K. A. Applegate. With respect to continuity within the series, it takes place before book #23, The Pretender, although the events told in the story occur between the time of The Ellimist Chronicles and The...

.

The Lerdethak is a large creature from the Hork-Bajir
Hork-Bajir
The Hork-Bajir are a race of aliens in the Animorphs novels.The Hork-Bajir are fictional aliens that are usually about seven feet tall. They are a dark shade of green and have three-toed theropod feet. Their necks are long and they have a mouth that resembles a falcon's beak with teeth. Their legs...

 homeworld, described as having a dark inner core, surrounded by a maze of snake like arms/tentacles. Through the arms/tentacles, a wide, drooping, blue-outlined mouth is visible.

Originally created by the Arn
Arn (Animorphs)
The Arn are fictional creatures from the Animorphs book series. The Arns' physiology somewhat resembles that of birds . It is possible that the Arn were the galaxy's masters of biological innovation. Interestingly, this race created an entire ecosystem after an asteroid destroyed much of the life...

, the lerdethak is a genetically engineered creature, which lived in the zone of separation on the Hork-Bajir
Hork-Bajir
The Hork-Bajir are a race of aliens in the Animorphs novels.The Hork-Bajir are fictional aliens that are usually about seven feet tall. They are a dark shade of green and have three-toed theropod feet. Their necks are long and they have a mouth that resembles a falcon's beak with teeth. Their legs...

 homeworld. Along with the lerdethak, the Arn created the Galilash, Gorks, and Jubba-Jubba, to deter curious Hork-Bajir from venturing into the lower valleys where the Arn lived. The lerdethak, and the other monsters, are controlled by mind-amplifier implants which are placed under the skin of the controllers scalp. Simple images as well as commands are sent to the monsters using this device.

The Lerdethak was one of the monsters used in the initial battle against the Yeerks on the Hork Bajir homeworld, led by Dak Hamee and Aldrea-Iskillion-Falan.

This is a morph possessed by Visser Three
Visser Three
Visser Three, born as Esplin 9466 Primary and later known as Visser One, is a fictional character and the main antagonist of the sci-fi book series Animorphs, written by K.A. Applegate. He is the leader of the Yeerk forces on Earth, having inherited the planet from Edriss 562, who was Visser One at...

, though how he came to possess it is unknown.
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