Yena Kim is a researcher at the Institute of Psychology, Leiden University. She received her PhD in comparative psychology at the Primate Research Institute, Kyoto University, Japan in September 2017. Her research interest includes prosociality, cooperation, and its underlying psychological mechanisms in human and nonhuman great apes. Currently, she is involved in a project, “Evolutionary insights into social intelligence: a comparison between humans, bonobos, and chimpanzees” directed by Dr. Mariska Kret, as well as a chimpanzee face perception research in collaboration with Dr. Masaki Tomonaga at the Primate Research Institute, Kyoto University, Japan.