During the late 1800s and early 1900s, it was common practice for milliners to decorate women's hats with birds' feathers and plumes--and sometimes with the birds themselves. As many as 300 million birds per year were killed for this fashionable enterprise, causing the extinction of some entire species and the endangerment of others. Lawmakers and bird aficionados were slow to react to the effects of this practice, which went on almost unabated...