the ex saw the difference at Brora, a wonderful little seaside 18, Hunters of Brora to distract the non-golfer. The greens are wired off to keep the sheep off!
On 14, a par 5, tee off from the bottom, up over a burn on to a plateau, second shot semi blind over the hill and down into a valley, third shot onto the green on a raised beach ledge. We come over the top of the hill and, lo, there's a sheep to the right of the green rubbing itself into the bank, a distinct hollow being formed from its efforts.
And that is the difference, a bunker - shaped by mother nature and modified by man, whereas a sand-trap is made by man.