Dryrth

The Dryrth were a race which largely resembled cows.

Cheese was used as their currency. After fighting a centuries long war the Dryrth acheived 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)