Males establish breeding territories after arrival of females. Single pups are born mainly in late June in California, late May-January in Galapagos. Females mate 3-4 weeks after giving birth, then make periodic trips to sea to feed. Young are weaned generally in 4-8 months in California but frequently after more than a year and sometimes three years in the Galapagos. Females sexually mature at about 4 years, may live up to 25 years; most adult females breed annually. Males first breed probably at 9-10 years.