The same aphid as yesterday, but here you can see its sucker they use for puncturing the plant and drinking the nutricious plant sap.
"Many aphid species are monophagous (that is, they feed on only one plant species).
Aphids passively feed on sap of phloem (the living tissue that carries organic nutrients) vessels in plants, as do many of their fellow members of Hemiptera such as scale insects and cicadas. Once a phloem vessel is punctured, the sap, which is under high pressure, is forced into the aphid's food canal. As they feed, aphids often transmit plant viruses to the plants, such as to potatoes, cereals, sugarbeets and citrus plants. These viruses can sometimes kill the plants.
Plants contain low densities of the nitrogen compounds needed for building proteins. This requires aphids to consume an excess of sap to satisfy their nutritional requirements. The excess is expelled as "honeydew", out of the recta of aphids, in such large volumes that in some instances it can "fall like rain".Aphid honeydew is rich in carbohydrates, like the phloem it derives from." wiki
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