Draft: Withdrawn: Grass-wolf-sheep
This is probalby obsolete! I strongly prefer !6 (merged), which is also more elaborate in terms of prosaic text.
So far, only to let you know that I will give this a try. Roughly following the respective NetLogo library model.
A first question that comes up is whether to use any kind of spatial indexing to accellerate finding nearby prey. Possibly just a grid of List or List holding the sheep present in each cell?