chameleon-like reptile based on the following: "... By the mother of the further moon, John Carter, how came you here, and have you become a Darseen that you can change your color at will?" And later, in the series: On Barsoom there is a little reptile called a darseen which changes its colors to harmonize with its background, just as do our earthly chameleons... There are no precise descriptions regarding this creature. Image by Tangor.