A világ legveszélyeztetettebb tengeri emlőse

(FILES) This handout pictured taken on October 18, 2017, and released by the Mexican Secretary of Environment and Natural Resources (Semarnat) shows scientists with a six-month-old vaquita marina porpoise calf -- the first ever caught as part of a bold program to save the critically endangered species, at the sea of Baja California State, Mexico. - Mexico's navy and the environmental organization Sea Shepherd are working together to prevent the vaquita porpoise disappearing forever. The species is critically endangered, due to illegal gillnets used to catch totoaba, a large fish whose swim bladder can fetch thousands of dollars in China thanks to its supposed medicinal properties. The navy stepped up surveillance in January amid criticism from the United States that Mexico was not doing enough to protect the vaquita, the smallest porpoise on the planet. (Photo by Semarnat / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / SEMARNAT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS