Fifty million years of farming. What?
We've only been around 200,000 years!  
Well, here it's a case of small is beautiful and sustainable.
Very small. 
Ants.
These  leafcutter ants  have worked out a complex system of agriculture, cultivating bumper crops of fungi that are the ants' sole food source. Foragers cut pieces of leaves from trees and drag them home to their nest, where others chew them into a paste that becomes the fungi's dinner.How clever is that!
More here:
Leaf cutter ants. The first Agriculture
Here is another from the National Geographic



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