Hippos are significantly more dangerous than Sharks.
Hippos slaughter humans for fun.
Sharks very rarely bite a human they mistake for a seal or catch a finger when they are already busy chowing down.

Dolphins are more dangerous, and on a significantly more disturbing level, than sharks are, to a human.
At worst, shark will kill and eat you.
A Dolphin, on the other hand, may like humans.
Really like humans.
In that getting to know you sort of way.

Not all dolphins, of course.
But they do hold a very rare distinction, along with Emus, as being one of the very few species to assault humans in that way.

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