Authorities shrunk protected waters in the Sea of Cortez and greenlit the return of fatal fishing techniques, endangering the world’s rarest marine mammal.By Johnny SturgeonKnown for their distinctive black-ringed eyes, lipstick-like mouth markings and timid, elusive nature, the vaquita is the world’s rarest marine mammal. Last year’s survey—carried out by a team of international scientists and state environmental officials—estimated just seven to 10 remain in the waters of Mexico’s Upper Gulf of California.