There may be a glimmer of hope for the extremely rare vaquita porpoise, the world’s smallest cetacean, a group that includes whales, dolphins and porpoises. The vaquita is also the most threatened marine mammal in the world, nearly extinct because of entanglement in fishing nets.
The latest expeditions to survey the mammal in the northern Gulf of California, Mexico, have yielded sightings of both vaquita mothers and calves. This, researchers say, indicates that the small porpoises are still reproducing despite threats.
https://news.mongabay.com/2019/11/vaquita-mothers-calves-spotted-expeditions-endangered-mexico/
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