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"Aphids suck the sugar-rich fluids from their host plants. Because these liquids are low in nitrogen, the aphids must consume large quantities of them to gain adequate nutrition. The aphids then excrete equally large quantities of waste, called honeydew, which is high in sugar content.
Where there's sugar, there's bound to be ants. Some ants are so hungry for the honeydew, they'll actually "milk" the aphids to make them excrete it. The ants use their antennae to stroke the aphids, stimulating them to release the honeydew. Some aphid species have lost the ability to poop on their own, and now depend on their caretaker ants to milk them."
Not sure where the Hover Fly comes into it though
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