Greedy vs. Altruistic Cows

In this model there are two breeds of turtles: cooperative red cows and greedy blue cows. Cows move around randomly, eat grass, and reproduce, if they have enough energy. Cooperative cows only eat the tips of the grass. This means the grass will grow back faster, but it also means that the cow won't get as much energy from the grass. Greedy cows practically pull the grass up by its roots. This gives them lots of energy but means that it will take longer for the grass to grow back. Under what conditions will the greedy cows become extinct and when do the cooperative cows become extinct?

With all controls fixed, experiment with stride length. Why is a big stride length better for greedy cows? How might this be related to the exploitation of developing countries?