"Delfin nie jest rybą."

Translation: A dolphin is not a fish.

[Euhan1]

Of course it is. Soon you'll be telling me that a cow isn't a fish!

[Yola448704]

Cows are fish the same way the dolphins are! -
Krowa jest rybą tak samo jak i delfin!

[PetrDiblik]

Are you joking? ☺

[Jellei]

Most of the time.

[Frank528974]

It is a mamal :-)

[Wippii]

Delfin jest ssakiem, ale je ryby.

[ADJD4]

Mammal is 'ssak'? What's the etymology of that?

[Jellei]

Well, it sounds kinda weird if you think about it. But it comes from "ssać" (to suck), because mammals suck their mom's milk... (can you say that in English? - well, anyway, you know what I mean).

[ADJD4]

Ok, it's a pretty similar etymology. I suppose what I was really wondering is how it ended up with a double letter at the beginning...

[Amanesse77]

If you really want to know why: this word comes from Old Slavic sъsati, it ended up with a double letter due to the loss of the weak vowel ъ (it was pronounced like the "u" in "pull")

[Jellei]

Hmm. I have no answer for that, but at least it's consistent with the verb ;)

[Jan.K.M]

Out of curiosity what's the fish called a dolphin in Polish (dolphinfish, mahi-mahi)

[Jellei]

Wikipedia redirects to this entry: https://pl.wikipedia.org/wiki/Koryfena