Well the issue is with multiple "cows" they all seem to move towards the same piece of grass, even when some of them shouldn't be able to see it or at least it seems that way
you have to reduce the LOS distance of view, the example i gave u uses 10,000 pixels.
a 200 /300 pixels should be more then enough to create a real kind of effect.
additional each cow would have to check other cows position and see if there are grass spots empty so they can go to them. so that needs to be implemented also as conditions.