homehome Home chatchat Notifications


Beluga whales, killer whales, and narwhals also go through menopause

It actually makes a lot of sense.

Mihai Andrei
August 28, 2018 @ 9:39 pm

share Share

It’s not just humans — researchers have found that at least four other species go through menopause, and they’re all toothed whales: belugas, narwhals, killer whales and short-finned pilot whales.

Beluga whale.

When it comes to menopause, we’re an outlier. Menopause has been observed in several species of primates, including rhesus monkeys and chimps, but as far as we can tell, most animals don’t go through menopause. However, the presence of menopause in other species remains an understudied field, and one which will likely yield more surprises in the future.

If you think about it, menopause doesn’t seem to make that much sense. In the “survive, reproduce, and conquer” of animal existence, there doesn’t seem to be a lot of incentive to stop reproducing. Even chimps, who do go through menopause, only do so in the final years of their lives, whereas in humans, it typically occurs between 49 and 52 years of age — with plenty of years still left. Alas, we’re not the only ones to do it. The authors of a new report, at the Universities of Exeter and of York in conjunction with the Center for Whale Research, focused on toothed whales.

Intriguingly, they found that menopause has evolved independently in three whale species: killer whales, short-finned pilot whales, and a common ancestor of the belugas and narwhals.

[panel style=”panel-info” title=”Menopause” footer=””]Menopause is the natural cessation of menstruation. Women are born with a finite number of eggs and they don’t make any new ones during their lifetime. When the woman runs out of her supply of eggs, the ovaries stop making estrogen, and menopause commences.[/panel]

But perhaps even more interestingly, this gives a remarkable insight into why menopause evolved in the first place. The key lies in the social structure.

“For menopause to make sense in evolutionary terms, a species needs both a reason to stop reproducing and a reason to live on afterwards,” said first author Dr Sam Ellis, of the University of Exeter. “In killer whales, the reason to stop comes because both male and female offspring stay with their mothers for life – so as a female ages, her group contains more and more of her children and grandchildren.”

Killer whales live in highly social, matriarchal groups. Females are responsible for taking care of the education and discipline of the younger whales. This gives the female killer whales an incentive to carry on living, but a disincentive to carry on reproducing.

“This increasing relatedness means that, if she keeps having young, they compete with her own direct descendants for resources such as food. The reason to continue living is that older females are of great benefit to their offspring and grand-offspring. For example, their knowledge of where to find food helps groups survive.”

Narwhals and belugas are not so well studied and their social structures are not as well known, but it’s likely that they share similar social characteristics.

The study has been published in Scientific Reports.

share Share

A Brain Implant Just Turned a Woman’s Thoughts Into Speech in Near Real Time

This tech restores speech in real time for people who can’t talk, using only brain signals.

Using screens in bed increases insomnia risk by 59% — but social media isn’t the worst offender

Forget blue light, the real reason screens disrupt sleep may be simpler than experts thought.

We Should Start Worrying About Space Piracy. Here's Why This Could be A Big Deal

“We are arguing that it’s already started," say experts.

An Experimental Drug Just Slashed Genetic Heart Risk by 94%

One in 10 people carry this genetic heart risk. There's never been a treatment — until now.

We’re Getting Very Close to a Birth Control Pill for Men

Scientists may have just cracked the code for male birth control.

A New Antibiotic Was Hiding in Backyard Dirt and It Might Save Millions

A new antibiotic works when others fail.

Researchers Wake Up Algae That Went Dormant Before the First Pyramids

Scientists have revived 7,000-year-old algae from Baltic Sea sediments, pushing the limits of resurrection ecology.

A Fossil So Strange Scientists Think It’s From a Completely New Form of Life

This towering mystery fossil baffled scientists for 180 Years and it just got weirder.

ChatGPT Seems To Be Shifting to the Right. What Does That Even Mean?

ChatGPT doesn't have any political agenda but some unknown factor is causing a subtle shift in its responses.

This Freshwater Fish Can Live Over 120 Years and Shows No Signs of Aging. But It Has a Problem

An ancient freshwater species may be quietly facing a silent collapse.