'Orca females stop reproducing around 40 and can live to 90, whereas males tend to live around 50 years.' Via NatGeo
The orca is one of only a handful of mammals known to go through menopause. The reason has remained murky, but now, new research suggests why: Grandmothers boost the survival of their grandcalves.
Ranging from polar regions to the Equator, orcas live in close-knit family groups of up 40 individuals. The predators work together to hunt a variety of prey, from fish to whales, depending on where they live. Generally, both male and female orcas stay in their natal pod throughout their entire lives, although both sexes search for mates from other pods to prevent inbreeding. Orca females stop reproducing around 40 and can live to 90, whereas males tend to live around 50 years.
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Natural selection would seemingly prioritize a female’s ability to have as many surviving offspring as possible, and ceasing to reproduce long before the end of life would interfere with that. The idea is supported by a variety of studies, including a 2004 analysis of pre-industrial Finns and Canadians, which showed that children with grandmothers were much more likely to make it to adulthood.
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