(c) Photo Kyle Cassidy
If you're unfamiliar with harvester ants, you'll be interested to know that they don't eat these leaves. They mulch them, and use the mulch to grow fungus which they do eat. They're farmers. Complex farmers. Fascinating beautiful complex farmers that enslave other ants and make them work in the fungus pits by secreting a chemical which the captive ants find irresistible. They dope them up and send them to the mines.
Kyle Cassidy, via