I've looked all over Google but can't find this anywhere.
It was shown on bbc2 either late 70s or early 80s and it was this animation where this land is populated by creatures with, er, extended willy things on their stomachs which they wpuld use to push humanoids into this large pit.
One scene that really scared me was when one of these creatures chased this polar bear round this hill, caught up with it and ate it. I was only 10 or so, but the blood was obviously red, and stood out on the white background: so it's not a very colourful feature. Not sure country of origin as there was no dialogue that I can remember.
That's all I've got. Any ideas?