I think Zaggy means that if a cow dies, the food it provides disappears. So if you morphed again, you would lose that food. (I think) This could be gotten around by having the store spawn a cow.
BTW, I tried to make an energy_source that morphed into energy_source_ and morphed back to make a cycle for having one energy source make more energy. The problem is that I while I have energy set at -15, it STILL takes it away when it morphs. It builds fine, but the morph doesn't give you 15 energy, but takes it away. Is this just my system (which is having some faults by memorizing everything) or what? Has anyone had any success with the energy source?
Oh, and the computer does horrible with stores, randomly choosing a few options every now and then...