Even since "The Sixth Extinction" was published a scant three years ago, grave threats to the survival of other species have emerged.
Fears have grown that heroic human efforts to save the vaquita, a small porpoise that lives only in Mexico's Sea of Cortez, will not be enough. Its numbers are down to a dangerous few, thanks to illegal fishing with gill-nets.
Rare right whales are being found dead in record numbers off Atlantic Canada. It is likely they're being run over by large ships or gotten entangled in fishing gear.
It ought to be taken very seriously.
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