Well, I admit ti being amazed this has lasted so long, with all the expertise here.
The Bristol connetion is a bit too obvious though! No!
Clue time.
This one is neither fish nor fowl, but nearly both.
It has a number of cousins.
One is a fish. Another a fowl, and a third might, in some parts of NW Europe be called a stumpy.
Or is that now too obvious?