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The world’s smallest marine mammal — the critically endangered vaquita porpoise, which lives only in Mexico’s Sea of Cortez — is believed to have only 10 living members, if that, of the species. The vaquita is widely thought to be on the verge of extinction, but a new scientific analysis by a team of biologists concludes the species remains relatively healthy and can survive — if the illegal use of ‘gillnet’ fishing ceases promptly.