It may be the Hawk Moth your on about
The thing that attracts an insect to a flower is the nectar inside the flower.
the insect does
Louse
Yes, an aphid is a small sap-sucking insect.
sucking ; nectar from plants
LeBron James xD I Dont Know Insect pollinated plants produce nectar to attract insect for pollination. The nectar is produced in the nectary glands present at the base of stamens and gynoecium and when the insect approaches the nectary gland, the pollen grains get stuck on its body and when this pollen loaded insect visit another flower of the same species, pollen grains from his body are off loaded on the stigma this flower. Thus pollination by insect is achieved and the insect is benefited by the nectar from that plant.
Some insects use siphoning, as if sucking through a straw, like moths and butterflies. This long mouth-tube that they use to suck up the nectar of the flower is called a proboscis.
pollen and nectar
Nectar
tick
horsefly
There Mouths Are Long And Made For Sucking.