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[–] 0x5f3759df 0 points 2 points (+2|-0) ago 

It's not the only one. Mesoplodon traversii is only known from five specimen washed up at various location in the south Pacific between 1872 and today.

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[–] florablo 0 points 1 point (+1|-0) ago 

You gave me a second one to research! Thanks.

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[–] 0x5f3759df 0 points 1 point (+1|-0) ago 

It is surprising how little is known about many whales species. I was recently looking at Wikipedia's List of cetaceans, because of course that exists, and was surprised at how many are listed with population "unknown" or conservation status "data deficient". So I suppose it's not that strange that there are some species that have never been seen alive. Perrin's beaked whale is apparently another one that has no confirmed sightings.