Rapids (mutants)

https://en.wikipedia.org/wiki/E._Barrett_Prettyman_United_States_Courthouse

Rapids were genetically engineered animals that acted as stormtroopers for the Cortex Commandos during the Mutant Vortex Crisis. The technology used to create the animals has been defined as abhorrently unethical and the technology has been banned since the end of the conflict. Most rapids were killed during and shortly after the crisis, though certain theorists have speculated that some rapids may have survived. The Royal Society's Extermination Task Force is responsible for the hunting down and extermination of any surviving rapids. It has been theorized rapids may have escaped to the east and west following the destruction of Cortex Castle.