Roverlisk

Roverlisks were an experimental zerg strain used by the Kulkulkan Brood in the battle on Bhekar Ro. Created by absorbing the genetic pattern of a dog, the roverlisks were so named by General Duke. In many ways, they appeared to be similar to zerglings, apart from what was implied to be a heightened sense of smell.

Considering that the original StarCraft manual states that the zerg are a highly selective species when it comes to genetic absorbtion, only assimilating genetic patterns from animals at the top of the food chain, the decision to assimilate the genetic of a domesticated animal seems strange. However, it was stated that the zerg queen which assimilated the dog's DNA did it as an "experiment", presumably wishing to test the creature's capabilities before inducting it fully into the swarm. Also, Kerrigan was in charge of the brood at the time, and might have had less stringent standards than the then deceased Overmind.

Regardless, the Kulkulkan Brood was wiped out and possibly the canine genetic material along with it. Regardless, roverlisks have not been seen in the swarm since the incident.