Séroni

The Séroni (singular Sorn; the plural is sometimes given as Sorns) are thin, fifteen-foot-high humanoids having coats of pale feathers and seven-fingered hands. They live in mountain caves of the high country (harandra in the speech of the eldila), though they often descend into the handramit where they raise giraffe-like livestock. They are the scholars and thinkers of Malacandra (the Sorn language for Mars), specializing in science and abstract learning. Their technical level is high, and they design machinery, which is built by the pfifltriggi. Although they can write, they do not compose written works of history or fiction as they feel the hrossa are superior at it. Their sense of humor "seldom got beyond irony" (Chap. 18).

Non-Canon/League of Extraordinary Gentlemen Crossover

The Sorns were among the many Martian species that fell victim to the alien invaders known as the "Mollusc". In 1898, the Sorns were part of the Martian coalition, led by John Carter and Lt. Gullivar Jones, that fought back at the invaders. They were pivotal in turning the tide in the Martians' favor, as they were seen wielding orbs that are capable in creating telekinetic powers, such as dissipating the invaders' black poison gas and toppling down a Tripod with ease.

It is during the battle that Carter and Jones discovered a single captive sorn being subjective to the invaders' sadistic experiments, in which it was surgically grafted with wings.