The survival chances of young orca whales are boosted by the presence of their grandmothers, especially in times of food scarcity, according to new research that offers a clue as to the evolutionary purpose of menopause.
원문출처 : https://www.cnn.com/2019/12/10/asia/killer-whales-grandparents-babies-survival-intl-hnk-scli/index.html
원문출처 : https://www.cnn.com/2019/12/10/asia/killer-whales-grandparents-babies-survival-intl-hnk-scli/index.html