Muto

"Mutos" was a derogatory term for those mutated by nuclear radiation in the Thousand Year War between the Thals and the Kaleds on Skaro. The Mutos themselves found that term offensive. (AUDIO: Guilt) Davros once described them as "weak, tattered, crippled relics of the war." (AUDIO: Purity) However, they eventually rose to prominence as a people in their own right. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)

Biology
Mutos generally looked like deformed Thals or Kaleds, but the mutations could vary widely. The Mutos lived in the wilds of Skaro, trying to scrape out an existence in the radioactive wastelands and were often hunted by Thals for use as slave labour. (TV: Genesis of the Daleks) Over time, the disparate groups of Thal and Kaled Mutos blended together into a gene pool of their own, later being recognised by some historians as a sentient race in their own right. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)

Origins
The Mutos were numerous by the end of the Thousand Year War. Once an individual became mutated, he was forced out onto the wastes by his deformity-free comrades, who were known as "norms". Both sides drove Mutos out to maintain racial purity, but the Thals used them for slave labour, particularly for dangerous jobs. (TV: Genesis of the Daleks) The Mutos sometimes engaged in cannibalism. (AUDIO: Davros, Purity)

During Davros's teenage years, a Muto ferryman provided a boat for those who wished to cross Drammankin Lake. Seeking to travel to the old Dal capital city, Davros and Elwyn bought the boat and rowed across. (PROSE: The Last of the Dals)

During the genesis of the Daleks
When she travelled back to the Thousand Year War with the Fourth Doctor, the Thals mistook Sarah Jane Smith for a Muto when they found her in the wastes. After finishing their neutronic missile, the Thals had Mutos load it without protection from the radiation used in its construction. Sarah Jane then led a revolt in an attempt to escape. The Thals' enslaved Mutos climbed up through the hanger. Several escaped but most were shot while ascending. (TV: Genesis of the Daleks)

After the neutron bomb
After the Daleks detonated a neutron bomb which ended the War once and for all, destroying most of the Thals, (TV: The Daleks) the Mutos were among the few surviving species on Skaro. Rising to prominence as a people in their own right, the Mutos helped the small number of surviving Thals learn to survive off the irradiated land. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)

Mwto Muto