Denizens of the murky rivers throughout Hyrule, Cueballs are normally harmless and usually spend their lives at the bottom of river beds feasting off of dead animals. With a Zola in charge though, a Cueball becomes a swift mount of death. These cavalry do well on land despite their aquatic preference, and serve as a very effective raiding tool in the Zola's army.
The Cueballs native to Hyrule have quickly became the cavalry of choice for the Empire of Bellum's military. These speedy creatures now serve as raiding units for land based incursions.