This edition of the Quarterly, coinciding with the 50th anniversary of the Endangered Species Act, features stories that explain the ESA’s inner workings and illustrate this landmark law’s continuing importance—including an account of how the ESA supported a successful legal challenge by AWI and allies to induce the USFWS to recommit to red wolf recovery. In this issue, we also address the woeful absence of protections for mice in research, highlight our campaign to promote better conditions for egg-laying hens, raise a glass to retiring staff member Dr. Mary Lou Randour, and more.