There is youth and quick spurts of growth. There are territories and methods of defense. Entire generations are wiped out when I find a nest of potato beetle eggs and smash them between my thumb and my index finger. Families lose loved ones when a bluebird carries off a brother or sister or mother or father in its beak. Through it all there is a balance.
Nature always makes things come out right.
It would be interesting to know how some of these things work. I have followed a cabbage moth the better part of a mile as it flits from one plant to another. It never stops moving in all of that time, hovering just long enough to find out if the plant in question is the one it wants. I follow the little white moth onto my property, and follow its meandering flight into my garden. But then finally, the moth gets to the last potato.