The Okar, or Yellow Martians an insular race living in the freezing northern regions of Mars. Their cities are built under glass domes protecting themselves from the harsh arctic environment.
Biology and Attire
The yellow Martians are essentially human. They have skin that John Carter described as "the color of a ripe lemon", and the men sport beards. When venturing out into the snow-filled land of the north, the yellow men wear heavy clothes made from apt and orluk fur, but within their cities they are as naked as any other Martian.
History
In the past they were one of the dominant species on the planet, it is apparent that at some point their skin color was slightly more reddish but still primarily yellow. The game of jetan is apparently based on their early conflicts with the black martians
When the oceans and seas of the world began to dry the brutal Greens became more numerous, they drove the Yellows further and further north, until finally the surviving Yellows reached what are now known as the Carrion Caves. They made a last-stand effort against their green-skinned tormentors, standing their ground in the mouth of the caves, which squashed the Green forces together, making it easier for the Yellow men to slaughter them. When the battle ended, the Yellows were victorious, and to discourage any further campaigns by the Greens, they piled up the bodies of all those killed in the battle at the entrance to the cave. The stench repulsed other invaders and attracted the fearsome apts.
Religion
Not much is known about yellow Martian religion, other than the fact that, until Carter exposed it as a deadly fraud, the yellow men apparently paid homage to the false religion of Issus and the Holy Therns. It is also of note that the ferocious apt was apparently considered sacred by those in Kadabra.