Many of us are lucky enough to remember going around to grandma's house to be rewarded with an assortment of nourishing treats. One could wonder if such occasions are vital for healthy development. Well, it turns out that it is true for killer whales, whose calves have their survival rate boosted thanks to valuable time spent with grandma, specially when food is scarce and the group count on experienced females to guide them to find fish sources. Indeed, it's been discovered that calves mortality rate increases four times when they lose their grandma!

More information:

nationalgeographic.com/orcas-killer-whales-grandmothers