New research on chimpanzees shows that female chimpanzees have been observed to undergo menopause. These chimpanzees living in an East African woodland continue living for decades after becoming biologically incapable of reproduction. This discovery challenges previous understandings of menopause and sparks questions about its evolutionary significance.
Published on ScienceNews, this research highlights a close genetic relationship between humans and chimpanzees, stating that both species are inclined toward post-reproductive survival.
The study focused on 185 females in the Ngogo community of wild chimpanzees in Uganda. The results revealed that hormonal indicators of fertility declined after reaching the age of 30, with no recorded births in chimpanzees aged over 50. Nevertheless, 16 Ngogo females lived beyond the age of 50, with some even reaching their 60s. These findings suggest that females in this community experience approximately 20% of their adult years after losing their capacity to reproduce.
According to anthropologist Kristen Hawkes from the University of Utah in Salt Lake City, some evidence indicates that the age at which female fertility declines is similar in humans and chimpanzees (Pan troglodytes). However, in other research, female chimpanzees, including those observed by Jane Goodall at Tanzania’s Gombe National Park, aged rapidly and often didn’t live past their early 30s, even though they continued to have menstrual cycles.
Hawkins claimed that “What’s surprising is so many females living so long after menopause”
In summary, this discovery challenges our existing knowledge of menopause in nonhuman primates and opens up new possibilities for researching evolution of this phenomenon.