The Perulian Cathicanth and the Cithica Maxicanth have a very symbionic relationship. The Perulian is a sentient aquatic being, closely related to the land-dwelling Hikki, and the Cithica is a large deepwater dwelling predator native to all of Midden's large oceans, proweling the depths in search of it's favorite food. the Cithica feeds mainly on a type of fish called the Gamb, which live in large groups feeding on debris found on the ocean floor. The smaller, and somewhat more nimble Perulian will swim around, stirring up debris and flotsam to attract the Gamb, who do not view the smaller sentient as a threat, and move in to feed. The Cithica will wait several minutes, sometimes up to an hour before swiftly moving in and striking a single Gamb, killing it nearly instantly with it's razor sharp beak. The Perulian will return to it's larger counterpart, to feed and rest, riding on it's back.
The Perulian also serves another purpose. The Cithica's large eyes are often beset upon by small parasites, who slowly eat away at the nictitating membranes that cover them. These can prove extremely harmful, as they can damage or even blind a Cithica's eyesight. The Perulian is easilly able to peel the parasites off before they can set in, and then promptly eats them. The Cithica also protects the Perulian, and even though they are not a social species, will often seek out mates with Perulians of the opposite gender of their own Perulian's, making it easier for both species to propigate.