YEs, many animals do live long enough to have many litters. But eventually it is more effecient to die. Maybe it won't be that way forever as evolution continues. And I agree that Nature is not a person or god but for ease of communication I said it that way. I know that it is just an impersonal process of natural selection.
And yes, we have gotten off topic some. Like I said, I have an idea for a new thread.