San Diego County Mammal Atlas. The diversity of mammals in San Diego County is greater than any other county in the United States, yet there has been no synthesis of their identification, distribution, natural history, or the conservation challenges they face—until now. The new San Diego County Mammal Atlas will serve as the definitive guide to the mammals of San Diego County. More than a decade in the making, the 432-page, full-color book covers the biology of all 91 terrestrial species and 31 inshore marine visitors known to have occurred here during recorded history (since 1769). Species covered in the book range from the desert bighorn sheep to the abundant California ground squirrel seen in neighborhoods across the county to the immense blue whale found along our shorelines. Mammalogist and lead editor Scott Tremor will share stories about the mammals who call San Diego County home. Scott Tremor is Curator of Mammalogy at the San Diego Natural History Museum (the nat). His expertise with mammals, especially rare rodents, spans both southern California and the Baja California peninsula. This local experience and relationships with the experts in the region have helped bring San Diego County Mammal Atlas to completion. Scott specializes in surveying for and identifying southern California mammals to the subspecies level. Public is invited and event is free. Free parking is located below Trader Joes/Ralphs. For more information on the event or the San Diego Sierra Club, please visit sandiegosierraclub.org or call 858-569-6005.