It's a cool speech, but it's also wrong. Mammals don't "instinctively develop a natural equilibrium", reality forces that equilibrium on them. A species gets to

It's a cool speech, but it's also wrong. Mammals don't "instinctively develop a natural equilibrium", reality forces that equilibrium on them. A species gets too good at breeding and/or resource consumption - that's either happy times for their predators who eat them back into balance, or they starve themselves back into balance.