"Elephant Don: The Politics of a Pachyderm Posse," by elephant expert and Stanford University's Caitlin O'Connell, is an outstanding book, based on more than twenty years of detailed research, about the lives of individual animals living as friends and rivals in Etosha National Park, Namibia (more details can be seen here, and the Kindle edition can be found here). In this monumental work you'll meet Greg, the Don, along with Abe, Keith, Mike, Kevin, Torn Trunk, and Willie.
When I read the manuscript for this book last year when I was asked to write an endorsement, I wanted it to appear right then. The book's description rightly notes:
"Though 'Elephant Don' is Greg's story, it is also the story of O'Connell and the challenges and triumphs of field research in environs more hospitable to lions and snakes than scientists. Readers will be drawn into dramatic tales of an elephant society at once exotic and surprisingly familiar, as O'Connell's decades of close research reveal extraordinary discoveries about a male society not wholly unlike our own. Surely we've all known a Greg or two, and through this book we may come to know them in a whole new light."