- "A flock of a dozen or so large radials, transparent as wineglasses and fully a foot across, came floating like a flight of lost balloons above the river. A few of them drifted over to the hexapeds and settled gently on their backs, flattening over their withers like weird berets."
- ―Cordelia sees balloons in action[src]
'Vampire balloons' was a name given by Aral Vorkosigan to a collection of floating creatures on Sergyar. They generally stayed near rivers and streams, attacking creatures that rested along the banks.
Their ability to float came as a result of hydrolyzing water and keeping the resulting hydrogen gas. The explosive properties of that gas proved useful to Aral and Cordelia Naismith during their trek across the planet.
- Shards of Honor chapter 2