Last One: Endangered Species.' Since its inception in 1973, the Endangered Species Act has become the most important tool in the fight to save animals from extinction. The law protects all creatures great and small, from ocelots to beach mice. By isolating species on black-and-white backgrounds, all are given equal consideration (and we hope equal attention by readers). Public support of the law is vital to its continuance, saving hundreds of species for future generations.