Two Killer Whales (IMAGE) University of Exeter Caption The theory that menopausal women store ecological knowledge is difficult to test in modern human populations, but as non-literate and highly social animals, killer whales can provide insights into how menopause evolved in humans. Credit Kenneth Balcomb, Center for Whale Research Usage Restrictions Must credit: Kenneth Balcomb, Center for Whale Research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.