Kaled

Kaleds were one of the two humanoid (or three, counting the Mutos) races which originally inhabited the planet Skaro (the other being the Thals). "Dalek" is an anagram of "Kaled".

Biology
Kaleds looked identical to Humans and Thals, except that unlike the Thals, they had dark rather than blonde hair. (DW: Genesis of the Daleks)

Kaleds can be distinguished from Humans by their blood. Tests by Kaled doctors showed that Humans and Gallifreyans were biologically very dissimilar to them, apart from external appearance. (DW: Genesis of the Daleks) Internally, Kaleds have purplish tissue and their ribs are more widely spaced than those of a Human. (DW: The Stolen Earth)

Culture
During the Thousand Year War, the Kaleds lived in a totalitarian government. Most of the common people lived in the Kaled Dome. The Scientific Elite on the other hand, lived in a special bunker. At the time that the Doctor visited, the leader of the scientists was Davros, though there was higher-ranking government. The Kaleds believed in racial purity, which is why they banished the Mutos. They also believed they were the only species in their galaxy and probably the universe most likely the reason why they became such Xenophobics when they discovered other sentient life ouside of Skaro. (DW: Genesis of the Daleks)

The Kaled god of war was a horned, demonic entity which is thought to have been inspired by the Beast. (DW: The Satan Pit)

History
The Kaleds lived on the same planet as the Thals and eventually fought the Thousand Year War with them.

Near the end of the war, Davros started to study the effects from the radiation on the native life on Skaro. He eventually concluded that the preferable result of these mutations would be the Daleks. In order to achieve this eventual outcome, he gave the means to destroy the Kaled city to the Thals. In "retaliation" for the destruction of the base, Davros ordered the creation of the first Dalek army, which he sent to destroy the Thals. Though the other Kaleds objected to this decision, Davros’ Daleks killed them as well. Eventually, the Daleks rebelled against Davros and were then trapped under the Kaled bunker by the Doctor. (DW: Genesis of the Daleks)