Ant Farmers?

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Is it just me or does anybody else find ants and aphids together? I am sure the ants are not eating the aphids, they seem to be fussing over them, ‘farming’ them as you would do if you kept livestock. 002

It may be a sugary excretion they like or something more sinister, but it seems everywhere I have aphids, green or black, I have ants. I got really close this morning and watched an ant stroking the aphid gently as if to reassure it. It was most odd!015

Or perhaps I am just making too much of it and they are deciding which one to eat!

Just found this article which seems to confirm the farming theory.