Moontails are genetically engineered versions of Viritails, being created for military purposes, entertainment, and scientific research. They have a complex and controlled trait list, ranging from common traits all the way to legendary ones. There are two main types of Moontails: Wild and Soldiers. Wild Moontails are those that have either been released into Tersca or have been born there. Soldiers are Moontails that were synthesized and raised for militaristic uses.

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Moontails, being based on Viritails, by default walk on two legs. However, traits have been developed to allow two legged Moontails to run on all fours (known as the Switch Pose torso), and to convert them to completely quadruped (the Feral Pose torso). Culturally, it has been noted that quadruped and biped Moontails have no interest in being anything more than friends. Even biped Moontails that have a switch pose torso will not find fully quad Moontails to be attractive. In addition, the amount of modifying it took to make Moontails quadruped in the first place means that they can not interbreed with biped Moontails. The two pose types are completely incompatible, and they find the idea of romancing each other highly disturbing.

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(There are STRICT RULES around quad Moontails, so please check rule 3!)