The two old friends hadn't seen each other lately. Now one of them was on her deathbed, crippled with arthritis, refusing food and drink, dying of old age. Her friend had come to say goodbye. At first she didn't seem to notice him. But when she realized he was there, her reaction was unmistakable: Her face broke into an ecstatic grin. She cried out in delight. She reached for her visitor's head and stroked his hair. As he caressed her face, she draped her arm around his neck and pulled him closer.
The mutual emotion so evident in this deathbed reunion was especially moving and remarkable because the visitor, Dr. Jan Van Hooff, was a Dutch biologist, and his friend, Mama, was a chimpanzee. The event — recorded on a cellphone, shown on TV and widely shared on the internet — provides the opening story and title for the ethologist Frans de Waal's game-changing new book, “Mama's Last Hug: Animal Emotions and What They Tell Us About Ourselves.”
Other authors have explored animal emotion, including Jeffrey Moussaieff Masson and Susan McCarthy in “When Elephants Weep” (1995) and Marc Bekoff in “The Emotional Lives of Animals” (2007). Still others have concentrated on a specific emotion, such as Jonathan Balcombe in “Pleasurable Kingdom” (2006) and Barbara J. King in “How Animals Grieve” (2013).
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