Gorillazons were a type of large fanged apes.
A few were kept in a zoo on Earth in the 22nd century. When the Tenth Doctor discovered a Dalek at the zoo, it transmitted an ultrasonic sound that drove the animals, including the Gorrillazons, berserk, creating a distraction while it captured a cage containing the Krikoosh. The Doctor soon cancelled out the Dalek signal using his sonic screwdriver, although the animals did not settle immediately. (COMIC: Carnage Zoo)