As Diana mentioned, we swapped Gordo and Terry in the reintro group yesterday to try to get a better idea of what might trigger Willy B’s antisocial behavior. The reunion between Terry and Honey B was easy – after a brief, half-hearted display, Terry approached the mesh and the two began to play, at which point we simply opened the door between them.
We knew that Gordo would be nervous reentering a group with Willy B so we tried to ensure that Cy, the group’s alpha, would be the first to greet him when the door was opened. We could have introduced Gordo to a subset of the reintro group initially but since they all know each other so well we thought we’d just get right to it.
There are several interesting things to watch here. First, you can see how Cy polices the behavior of his subordinates and protects the vulnerable—you can see his “feets of fury” (thank you, Sabrina) in action in the playroom scene as he tells Willy B to step down. He’s a good guy. Second, you can see how the females attempt to modulate the behaviors of the males through distractions and grooming. Rayne is particularly adept at this and very in tune with the needs of her group, always watching for moments when the boys might need a little help getting along. And finally, you can see clearly how chimpanzees express trust in one another—which is, of course, by putting sensitive body parts in each other’s mouths.
This interaction between Gordo and Willy B may seem at first glance like two best friends rejoicing in being reunited but this is actually what is looks like when chimps don’t trust each other. These lengthy, exaggerated displays of vulnerability (e.g., putting your fingers, backside, or scrotum in between another chimps’ gigantic canine teeth) are more common when there isn’t already a solid basis of trust. It’s also common for males to display erections in these circumstances, which may be another evolved display of vulnerability (chimp penises are usually fully retracted into the body for protection). I imagine some of our own greeting gestures such as shaking hands and bowing aren’t that far removed from these same behaviors, though obviously a bit more PG-rated according to our sensibilities.
It will be interesting to see how Gordo’s presence (and Terry’s absence) in the group changes Willy’s behavior, if at all.
