Calving in Hyperoodon planifrons occurs in the spring or summer. The young measure about 3 meters at birth. Very little information is known about the reproductive cycle of H. planifrons, but it probably resembles the cycle of its close relative, Hyperoodon ampullatus, northern bottlenose whales. In that species, females probably give birth every 2 years, with a gestation period of 12 months. Weaning of young takes place after one year. Sexual maturity of female bottlenose whales is reached between the ages of 8-12, and in males, between 7-11 years of age. The life span of H. planifrons is at least 37 years.
(Tinker 1988, Nowak 1997)
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous
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