Pods are made up of one dominant male and a number of other males and females. The dominant male mates with reproductively available females.

Mating System: polygynous

Female Pacific white-sided dolphins reach sexual maturity around 5-6 years of age, males are sexually mature at 8-10 years. Generally breeding occurs in the summer or fall, and gestation lasts approximately 11-12 months. Females give brith to a single calf, which is almost 3 feet long and can weigh up to 14 pounds.

Breeding season: Generally breeding occurs in the summer or fall.

Average number of offspring: 1.

Range gestation period: 11 to 12 months.

Range age at sexual or reproductive maturity (female): 5 to 6 years.

Range age at sexual or reproductive maturity (male): 8 to 10 years.

Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous

Average birth mass: 14000 g.

Average number of offspring: 1.