Selligores are colorful but harmless creatures. While their size - upwards of 20 meters long - can be frightening, their diet is primarily made up of small fish, plankton and oxygenating plants. Like many other watergoing mammals, they have incredible stamina, able to survive for hours at a time between breaths. However, they can also survive on land, if only for brief periods (they dehydrate very quickly and the lack of water pressure is extremely dangerous for them). Selligores have long fed and lived along the coasts of their world, primarily surviving in shallow waters (less than 100 meters deep), with regular forays to the surface. However, the animals are finding less and less of their habitat free for feeding or roaming. While Corsin's prior government established large habitats for the animals, the current Imperial regime has chosen not to prosecute violations of the statutes and is authorizing development of some habitat areas. There is no doubt that the current population cannot sustain itself with the smaller feeding area. A number of attacks on Humans and other sentients have been reported.

Selligores have largely remained apart from Corsin's traditional population. One exception to this are the natives of the Tinn'lyi Islands, who have long maintained a supportive relationship with these animals. The Tinn'lyis will gather rich plant life and leave it on shore, while certain members of the Tinn'lyi nation will assist the selligores as they drag large nets behind them, scooping up large quantities of fish. In this way, the selligores and the Tinn'lyis feed each other, and both groups have prospered from the relationship. Biologists have devoted much time to study the situation, and several scientists have put forth this example in their efforts to convince the current regime to protect and cooperate with the selligores.

Selligores can live up to 45 local years (about 42 standard years). When they are born, they are quite helpless. They are birthed in an air-filled sac. Osmosis slowly fills the sac over several hours, while the selligore slowly learns the rudiments of water life (young selligores can swim). Adult selligores do not "swim," but are buoyant enough to "float" long distances. Selligores normally stay in their territory, but some herds have migrated in "once in a generation" relocations, normally due to infringement on their feeding grounds. Selligores can survive in deep waters, but they show a strong preference for near-surface shallow waters.

Selligores are normally found in small herds of five to 10 animals; males normally outnumber females by a factor of two to one. Selligores are quite territorial, and herds have been known to have conflicts over grazing areas, although any injuries inflicted in these battles are often minor.