If so, what animal was it and what was so anomalous about it?

I have seen multiple snakes and turtles with two heads. I've seen cats with extra toes, too.

-- BK

sometimes

Once, as far as I remember.

Several years ago, In the cove I tend to visit, there are two species of blenny fishes that live arround one specific rock.

One is tompot blenny, a rather friendly and hard-to-see fish that tends to live in groups. Then there is a red black-faced blenny, the timid species tha trather move in the bottom.

One day, I saw a literal "crossbreed" blenny(?) that had red body and brown head. It was the only one there. I tought it was Tripetrygon Melanarium but no, the fish I saw had red body and branching horns.