Glommer

The Glommer is a predator genetically engineered by the Klingons to hunt, kill and eat Tribbles. The first Glommer of its kind was stolen by Cyrano Jones[] in 2269 claiming it under the space salvage laws.

That same year, Captain James T. Kirk[] rescued Cyrano Jones from the Klingons. Cyrano brought the Glommer with him onto the USS Enterprise. After the Tribbles grew to be enormous, the Glommer did not seem so eager to eat them. (TAS: "More Tribbles, More Troubles")