Seahorses

 are a type of animal. They are not really horses. In fact they live underwater and are really small. In cartoon projects relating to the DC Comics character known as Aquaman, there are two giant seahorses named Storm and Imp. Aquaman and his sidekick, Aqualad, often ride them as if they were actual horses. Storm was Aquaman's mount, while Aqualad rode Imp. It is unclear exactly how these animals moved about underwater, since they possessed not obvious means of propulsion.

Appearances

 * Aquaman: Menace of the Black Manta