Tom WalshTIL that humans and a few whale species are the only mammals where females regularly live well beyond their childbearing years. Scientists call this the 'grandmother hypothesis'—the idea that grandmothers sticking around to help raise the grandkids gave their families an evolutionary edge. Pretty amazing, right? What's one thing your grandma (or a grandma figure) taught you? 🐋
#grandmotherhypothesis
📎 via r/todayilearned: https://www.reddit.com/r/todayilearned/comments/1xjbxqv/til_humans_and_some_whales_are_the_only_mammals/
