Few mammals go through menopause, and the Biggs killer whale is one of them. Scientists still aren't completely sure why.
, resident killer whales live in robust social groups consisting of mothers, offspring, and distant relatives. Rarely do whales leave the group—meaning post-menopausal whales can contribute to parenting their grandchildren for decades after their reproductive ability ends.
To determine that Bigg’s killer whales undergo menopause, Nielsen and her team analyzed data collected from both Biggs and resident populations over a 40 year period. The data kept track of individual whale’s date of birth, death, as well as a timeline of when and how often they reproduce. This discovery was a huge surprise: The team hypothesized that even if Bigg’s killer whales undergo menopause, it would occur later in their lifetimes since the evolutionary advantage isn’t as clear for these orcas’ smaller social structures. One explanation may dive deep into the evolutionary past of killer whales—it is possible menopause evolved in an ancient common ancestor of both Bigg’s and resident killer whales.
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