Chimps Steal Less Often From Their Friends, Even When Offered Pineapple NYT - Top Stories By: Taylor Mitchell Brown 23 October 2026 at 15:08 The discovery may hint at the roots of human norms around fairness and friendship. © Innocent AmpeireChimp friendships are largely initiated by grooming. They are “popping pimples; they’re looking at little scabs; they’re scratching things,” Dr. Lewis said, behaviors that release bonding hormones like oxytocin.
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