Breeding in California condors begins at 6 years of age at youngest. A single egg is layed every other year by a breeding pair. On reaching full maturity, male G. californianus make courtship displays of outspread wings and head bobbing. After a female accepts a male's overtures, the birds form lifelong monogamous pairs. The incubation period is about 56 days and eggs are layed between February and April. Nests are found in cliffside caves or among rocky outcropping and clefts. Both parents care for the single egg and nestling. Young G. californianus remain with the parents for up to a year before leaving the nest; the young begin to fly at 6 to 7 months.
(Greenway 1967; Mountfort 1988)
Average time to hatching: 57 days.
Average eggs per season: 1.
Average age at sexual or reproductive maturity (male)
Sex: male: 2190 days.
Average age at sexual or reproductive maturity (female)
Sex: female: 2190 days.