Dryrth

The Dryrth were a race which largely resembled cows. They were native to Dryra, where they built small villages of white buildings with gardens on the roofs.

Cheese was used as their currency. After fighting a centuries-long war, the Dryrth achieved peace. Ravnok was sickened by this peace and created a virus which wiped out nearly all of the Dryrth. (COMIC: The Lunar Strangers)

When the Doctor's TARDIS was invaded by a vortex parasite, a Dryrth was among the creatures it created to fight a simulation of the Eighth Doctor. (COMIC: A Matter of Life and Death)