The Pacific white-sided dolphin is an oceanic dolphin broadly distributed in the North Pacific, and it also occurs in coastal areas. Males reach about 1.7–2.5 m and females about 2.3 m, and they are characterized by a gray marking (suspender stripe) extending from above the eye to the tail. They mainly feed on schooling small fish such as anchovies, sardines, and herring, and on squid, and can cooperate in groups when hunting. They are highly acrobatic, frequently performing large leaps, bow-riding, and porpoising. Breeding occurs from late summer to autumn; gestation is about 11.5 months and the interval between births is about three years. The IUCN lists the species as Least Concern.