In 2007, Dr. Irene Pepperberg said goodnight to her avian research subject, Alex, an African Grey Parrot. “You be good,” he replied. “I love you.” “I love you, too,” Dr. Pepperberg said, to which Alex asked, “You’ll be in tomorrow?” “Yes, I’ll be in tomorrow.” Alex died the next morning, prompting an international outpouring of grief that included an obituary in the Economist. We speak with Dr. Pepperberg, whose pioneering experiments with Alex revolutionized the field of avian cognition, about how she used communication as a window into his mind.