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What's the halachik classification as to why Dolphins aren't kosher?

Is it because:

Dolphins are like a fish

they live in the ocean and thus the Torah considers them a fish and they don't have fins and scales?

OR

Dolphins are like other mammals

they're a mammal and like the other kosher mammals they don't have split hooves and chew their cud?

Practical difference: (H/T Heshy)

What warning would witnesses have to give to someone who's about to eat Dolphin;
"don't eat that non-kosher fish!" or "don't eat that non-kosher animal!"

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  • Bats are mammals but their feet don't matter. What do you mean by "like other mammals"? – Double AA♦ Mar 28 '19 at 17:47
  • @DoubleAA that have the traits of mammals- warmblooded, don't lay eggs, etc thoughtco.com/the-main-mammal-characteristics-4086144 – alicht Mar 28 '19 at 17:56
  • @DoubleAA I think the answer to the question is found in the one you linked it to, thanks (Aruch Hashulchan) – alicht Mar 28 '19 at 17:56
  • Bats have those traits but their feet don't matter. – Double AA♦ Mar 28 '19 at 18:11
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    Either the Atalef is a bat (or the Tinshamet is a bat) or the Atalef is a platypus. Those are pretty much your options. – Double AA♦ Mar 28 '19 at 18:31