While playing around with my macro lens I spotted a flock of aphids being maintained by a few ants. They were milking their aphids and protected them from a few ladybugs that tried to get to them.
PS: All these photos have been flipped 180 degrees. The aphids were on the underside of the leaves.
Ants harvesting their flock of aphids
Ants minding their flock of aphids 5
Ants minding their flock of aphids 4
Ants minding their flock of aphids 3
Ants minding their flock of aphids 2