Which of these sea creatures is not a fish?

I hope anyone reading this has a lovely day 🙂

My blubber keeps me warm too

doiphin my favorite mammals think like a humy dolphin name susu

Fredrico, There is also a Dolphin fish.

my faves forever...flipper...cindy & sandy... Florida natives.

Bryde’s whales

RIP lovely baiji. Your species went extinct far too soon. The vaquita porpoises are next, followed by the Gulf of Mexico whales (Bryce’s whale’s subspecies). It is time to STOP KILLING the intelligent sea mammals !