Manatees, perhaps? That's the only thing I can think of.

Marlins?

No, they didn't look like either of those creatures. I'm pretty sure they were dolphins. Maybe the person who told me otherwise was wrong.

Probably dolphins, then. Unless they were porpoises.

What sort of water were you near? Lake? Ocean? River? It's hard for me to judge dolphin likelihood without geographic context.

But I have seen dolphins upriver before, when I visited Savannah, GA this past spring. So I suppose anything's possible so long as you're downriver from a fall line.

It was near the ocean or at least where a river meets with it. I guess they might have been porpoises, but I really thought they were dolphins. Oh well.