I am weeding my garden. It's a slow and tedious process. It's not helped by the insect activity around the flowers. How can I haul them out of the ground when they're covered in feeding insects?
You know that spring is here when the hoverflies are out and about. Adults dart from flower to flower, feeding on nectar and pollen. Their larvae dine on fungi and aphids. (Some species have aquatic larvae known—accurately if not flatteringly—as rat-tailed maggots.)
Hoverflies are harmless*. They don't bite or sting. But the black-and-yellow banding and the wing-buzzing (in some larger species) might mislead predators into thinking that they're looking at bees or wasps. Afraid of being stung, they leave hoverflies alone to get on with the business of zipping around flowers and ushering in spring.
* If you're not a fungus or an aphid