"The Narrow Edge: A Tiny Bird, an Ancient Crab, and an Epic Journey" by Deborah Cramer (Yale University Press): Each year, the rufa red knot makes a 19,000-mile round-trip journey from the edge of South America to the Arctic and back, en route doubling its weight by feasting on the eggs of the horseshoe crab. (The blue blood of horseshoe crabs is beneficial to humans as well.) But, as Deborah Cramer details in the paperback release of "The Narrow Edge," climate change has resulted in the bird being classified as a Threatened Species by the U.S. Fish and Wildlife Service, and the rufa red knot, she argues, might be the first "canary in the coal mine" for several endangered bird species.