Mama's Last Hug by Frans de Waal is a fascinating exploration of the rich emotional lives of animals, beginning with Mama, a chimpanzee matriarch who formed a deep bond with biologist Jan van Hooff. Her story and others like it—from dogs "adopting" the injuries of their companions, to rats helping fellow rats in distress, to elephants revisiting the bones of their loved ones—show that humans are not the only species with the capacity for love, hate, fear, shame, guilt, joy, disgust, and empathy. Frans de Waal opens our hearts and minds to the many ways in which humans and other animals are connected.