Input (grade 13): As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods.
Output (grade 7): As their common name suggests, they are often seen hovering or sucking nectar at flowers. The adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods.