Killer Whales, aka Orcas, actually are dolphins!
And they got their name as a mistranslation into English - if I remember correctly they were originally named in Spanish as "killers of whales" or "whale killers", because they do that
And they got their name as a mistranslation into English - if I remember correctly they were originally named in Spanish as "killers of whales" or "whale killers", because they do that
Wiktionary supports that etymology, and it is generally a high-quality source for etymology, but it's troubling that this one isn't cited.
Orcas are indeed dolphins, and also whales.