Like people, female killer whales undergo menopause, living long after their baby-bearing days are done. But why people, and whales, do so is very much up for debate. Now, a new study says the reason-at least in killer whales-may have to do with who holds information critical for the group's survival.
Researchers found evidence that menopausal whales act as a kind of library of information, directing their groups or pods to where they can find food when fish are scarce. In this way, older females give their pods a greater chance at survival, according to the study, published March 5 in the journal Current Biology.
(Source: National Geographic)