Galéria: A világ legveszélyeztetettebb tengeri emlőse
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(FILES) This handout picture released by World Wide Fund for Nature (WWF) and taken on February 1992 in Santa Clara Gulf, Sonora, Mexico, shows a dead vaquita marina (Phocoena sinus) thought to have died due to illegal gillnets used to catch totoaba. - 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 Omar Vidal / WWF / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / WWF / OMAR VIDAL" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS