VAQUITA: THE MOST ENDANGERED MARINE MAMMAL IN THE WORLD Restricted to a small area of relatively shallow water in the Upper Gulf of California, Mexico, lives the vaquita, the world's smallest porpoise67. The vaquita is now in imminent danger of extinction due to the continuous entanglements with lost and illegal gillnets set to catch the totoaba, © Omar Vidal / WWF 18 another endangered fish whose swim bladder is prized on the black market68. The latest scientific estimates issued on March 2019 by the International Committee for the Recovery of the Vaquita (CIRVA) indicated that only about 10 vaquitas remain alive in 2018 (with 95% chance of the true value being between 6 and 22). The vaquita has been reduced to such low numbers as a result of bycatch in gillnets69.