Ok, so i'm trying to figure this one out...
Cicadas. Every 17 years these little things crawl out of the dirt, hump each other, get eaten by animals and/or die. Their short existence during the summer feeds the food chain and fertilizes the ground. Every 17 years then, there is a sort of "renaissance" in nature because of these little things.
Great, ok. So there is 1-1.5 million per acre. Now, my question becomes this: Over the past 17 years i've dug a lot of holes...why the hell haven't i seen any evidence of these things?