Fitted upon every Eartha egg is a decorative mask complete with purple plumes. Rather than being harmed in circumstances where its mask is removed, the egg will undergo suspended animation and refuse to hatch until the mask is properly replaced. Curiously, the feathers are genetically unrelated to the Eartha and do not belong to any known species of creature on Ark.
Acutely sensitive to the environment, an Eartha's own well-being is directly correlated to the health of their surroundings. A population living in areas subject to deforestation, regardless of severity, are more likely to succumb to disease than a population residing in lush, undisturbed forests.
Eartha are reluctant to produce their own offspring. To compensate, they adopt and raise the orphaned young of other species. The biological children that Eartha do manage to produce, known as kits, arrive in broods of three or fewer. Eartha kits instantly embrace their adopted siblings without a second thought.
Ancient literature recovered from the ruins of long-gone civilizations show that Eartha were once widely subject to worship as the incarnation of nature itself.