Aphids produce honeydew, a sugary by-product, or excreta, of all that plant sucking they do. Ants, among other creatures, love the energy-rich stuff, and so harvest it from the aphids. They will also protect the aphids from aphid-predators, as if they were shepherds watching over the herd.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
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