Due to a terraforming snafu, the planet of Pegasus only has Oak-type trees growing on it and no large prey animals to sustain a Human population. The original group of settlers sold their contract to the planet at a highly discounted price.
The founding members took the name Dryad and genetically modified themselves to consume only Oak leaves and sap, making them immune to tannic acid.
As a result the Dryad skin is significantly darker, verging on ebony, but their hair is naturally blond. Named for the mythical Greek spirit, the Dryad.