Koi fish I've seen in Japan and Florida.
I love to watch them swim but they seem to be at the very bottom of the food chain...to put it lightly.
A species more suited to indoor tanks or protected ponds.
I've seen a few blue heron and wild river otter in the
https://en.wikipedia.org/wiki/Huron_River_(Michigan) but not enough for me personally.
Never seen a mink in the wild yet.