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> Google says that there are about a billion sharks in the world but only 50k orcas. Meanwhile there are only about 10 humans killed by sharks a year. So zero recorded humans killed by orcas isn't that surprising. I wouldn't personally volunteer to swim with them.

Sharks are a group of taxonomical orders. Orcas are a species.

You wouldn't want to swim with them anyway, for the same reason you wouldn't want to run with a herd of stampeding cows.

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Orcas are almost certainly several different species as well, but they remain officially classified as one until scientists agree on how to divide them up.

I thought orcas were traditionally divided into three types. There is no standard for what is or isn't a "species".

But it doesn't matter at all; the difference between the taxonomic level of "sharks" and the taxonomic level of "orcas" is unimaginably large regardless of what you want to call the levels.

I thought the standard was that they had to produce fertile offspring.

Not at all. Without even mentioning plants and bacteria, wolves are canis lupus and dogs are canis familiaris. But interfertility is often a bigger problem between two types of dog than it is between a dog and a wolf.

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