Fast Facts: Unarmored Three-spine Stickleback, Southern California’s Small, Endangered Fish

LOS ANGELES—Southern California’s unarmored three-spine stickleback has made headlines periodically, most recently over a lawsuit that was filed on Jan. 18 by the Center for Biological Diversity against the Trump Administration for allegedly failing to take measures to protect the endangered fish. What is the three-spine stickleback and what is going...