Referred to as "flying fishes", Piranhas are yellow torpedo-shaped fish-like robots with large jet motors on their back, grey dorsal and pectoral fins, black eyes on the front, and a grey lower jaw below their eyes.
In Knuckles' Chaotix, Piranhas are only found in Marina Madness. They have rather simple pattern of hovering back and forth in midair. Occasionally, when the player is standing below the Badnik, Piranha stops and and belches up small mine that explodes after landing on the ground. It is possible to get hit by Piranhas in certain arenas with hovering high-tech marinas.
After that, Piranha hovers at one place for couple of seconds before continuing its regular pattern, as giving an opportunity for the player to perform Spin Jump into it. Like many of the enemies in the game, Piranhas are powered by synthesized Rings which they drop upon defeat.