Getting close!  I now have curses up and running, with color codes
for the different types of animals (herbivores, carnivores, and
omnivores), but if you have to prematurely end the program, it will
mess up your terminal.  I feel like there is some set of constants
that will give me a sustainable ecosystem, but I'm not sure what it
is.  As of now, the plants can always proliferate faster than they die
(which is as it should be, I suppose), so they always end up taking over
the entire map.  I'll do some research into what makes an ecosystem
sustainable. There's also the chance that my predators are efficiently
predatoring, and I don't think things are breeding properly.