Really, really small scale but, it really is farming.
A 2007 article from the website ‘Science Daily’ gives an excellent explanation of how ants control aphids. Aphids are sometimes called Ant Cows because they are herded by ants and exude a sugary ‘honeydew’ that ants eat.
The aphids above were on one of the pea flowers that grow in the mangroves on the way to Ponce De Leon Park. Taken with a D90, 105mm f2.8 VR Micro-Nikkor, TC-14E teleconverter at 1/320 second, f16 using an SB-800 flash.