Chimps and Bonobos Form Friend Circles Like Humans Do

Scientists just discovered that chimpanzees and bonobos are more like us than we thought. They don't just socialize randomly—they build structured friendship circles with close besties and casual acquaintances, much like humans scrolling through their contact lists.

Researchers from Utrecht University studied grooming patterns in 24 groups of chimps and bonobos to understand how our closest relatives manage their social lives. Grooming isn't just about hygiene for apes—it's their version of grabbing coffee with friends, strengthening bonds and showing who matters most.

The team found that most apes spent the majority of their grooming time with a small circle of preferred partners while keeping lighter connections with many others. Sound familiar? That's exactly how human friendships work, with a few close confidants getting most of our time and energy.

Apes living in larger communities became more selective about their relationships, just like city dwellers who can't possibly be close friends with everyone they meet. The parallel to human behavior was striking.

But here's where it gets interesting: chimps and bonobos take different approaches to friendship. Bonobos spread their social time more evenly, creating egalitarian networks where everyone gets some attention. Chimpanzees concentrate their efforts on smaller groups of chosen companions, investing deeply in select relationships.

The differences don't stop there. As chimpanzees age, they become pickier about who deserves their time, narrowing their social circles to focus on quality over quantity. If that sounds like your parents or grandparents, you're onto something—humans show the same pattern.

Bonobos, however, keep their social doors open throughout their lives. Their more fluid social system allows bonds that cross group boundaries, something rarely seen in chimpanzees.

Why This Inspires

Lead researcher Edwin van Leeuwen says these findings reveal deep evolutionary continuity in how complex societies organize themselves. The same fundamental rules appear to guide social effort across multiple species, suggesting friendship isn't just a human invention—it's an evolutionary strategy millions of years in the making.

Understanding these patterns could unlock insights into cooperation, social learning, and emotional well-being across species. The research shows there's more than one successful way to build a social world, whether you're a human, a chimp, or a bonobo.

Our need for close friends and wider communities isn't learned behavior—it's written into our shared evolutionary history.