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Why is it – amidst the flood of environmental statutes that poured into the law books and national consciousness in the remarkable decade of the 1970s – that the Endangered Species Act of 1973 (ESA) stands out as quite uniquely different? This Essay briefly surveys the ESA’s differentness, its special political context, the citizen suit of great notoriety that fired up the ESA’s political hotseat back in 1975, and what has changed and what has not in the years since that first eco-legal outburst.