Natural causes appear to have claimed just one, a marine snail.
We barely got to know many of the others. These excerpts from the book written by Douglas H. Chadwick and photographed by Joel Sartore, depict a few survivors. This mangy Florida panther photographed itself by tripping an infrared beam. When wildlife biologists saw the photograph they were enthusiastic about how much better the panther looked since they'd last seen it. More than a century of inbreeding has seriously depleted the panthers' gene pool, making them subject to disease, congenital defects, reproductive failure, and other calamities.