Yellow Vampire dragons were mentioned once in How to Speak Dragonese: "An enormous number and variety of dragon species were being held prisoner behind the bars of this cage. Deadly Nadders, Flying 'Gators, Big Spotted Gormlesses, Yellow Vampires, Common or Gardens—you name it, they were all there, trapped together in a furious tangle of talons and wings and fangs, ready to be sent back to the restaurants and shoemakers in Rome." ―How to Speak Dragonese