After a beloved gorilla at the Toronto Zoo named Charles died last month, hundreds of people visited his enclosure to mourn and lay flowers. But did his fellow apes understand that he had died? Did Charles ever contemplate his own mortality? Susana Monsó has long contemplated questions like these as she seeks to understand how animals understand death. The philosopher joins Piya Chattopadhyay to talk about how all kinds of animals relate to mortality... and what we humans might learn from them.