Between 1 and 4 billion hoverflies migrate into and out of southern Britain each year These migrants provide important pest control by consuming 3–10 trillion aphids They also provide extensive pollination services and long-range pollen transfer Migrant hoverflies play a vital role due to declines of other beneficial insects
Click here for more information.: Mass Seasonal Migrations of Hoverflies Provide Extensive Pollination and Crop Protection Services: Current Biology