It sounds like the setup for a joke: what do you get when you tickle a baby gorilla? Writing in the journal Current Biology, researchers give the answer: data on the evolution of laughter among the primates. The authors of the paper recorded the sounds made by tickled gorillas, chimpanzees, bonobos, and human infants, and analyzed them for similarities and differences. We'll talk with the lead author of the report about what she found, and what the work can tell evolutionary biologists about laughter and other social behaviors.
Produced by Charles Bergquist, Director and Contributing Producer