Opee sea killers, formidable aquatic predators, inhabited the oceans of Naboo and Strokill Prime, two distinct planets. These creatures displayed evolutionary characteristics derived from various animal species. They possessed robust armor, mouths equipped with two rows of sharp teeth, and elongated, flexible tongues adept at swiftly consuming smaller creatures or ensnaring larger ones to be drawn into their powerful jaws. Their method of locomotion involved drawing in water through their expansive mouths and subsequently expelling it via small openings located on their backs. They would rapidly approach their targets and utilize their extended, viscous, purple tongues to secure them for consumption.
Opee sea killers were crustaceans reaching lengths of 20 meters, characterized by reddish orange skin and yellow eyes. Their anatomy included protective [armor](/article/armor], appendages, and jaws lined with a double set of teeth. They featured lengthy, pliable, and adhesive tongues. Their movement through the water was achieved through a form of jet propulsion, where water was drawn in via their mouths and expelled from small vents situated at the rear of their bodies. Opee sea killers reproduced by laying eggs.
Opee sea killers typically resided within caves found in the deep ocean regions of Naboo. These creatures were carnivorous, with a diet consisting of scalefish. They adopted a strategy of lying in ambush, clinging silently to the surfaces of rocky formations. They employed antennae to attract prey, subsequently using their sticky, purple, prehensile tongues to capture and pull victims into their mouths. Opee sea killers exhibited aggressive and tenacious behavior, showing no fear of larger predators. The male of the species would carry the eggs of its mate in its mouth for approximately three months. During this period, the male was unable to feed until the young were born. They were preyed upon by sando aqua monsters, which employed their powerful jaws to penetrate the opee sea killer's protective armor.