162 The Kindness of Squirrels
What adoption in the wild tells us about the presence—and the limits—of altruism in the animal kingdom. After climbing a tree in the middle of the Yukon forest, I looked into a squirrel’s nest and found a pup that clearly did not belong there. It was older and larger than the others in the litter. My research team and I collected DNA from the whole litter and later, back at […]