You may have seen a hoverfly before. You also may have mistaken it for something else — a bee, or a wasp. They are masters of mimicry, imitating more dangerous insects to avoid predators.
Fredrik Sjöberg is not fooled by these disguises. He's spent the last thirty years hunting for hoverflies, and can distinguish between species based on tiny differences in antennae color or wing shape.
Sjöberg is an amateur entomologist, but a committed one.
"You want to know something that no one else knows," he explains, "you want to become the real expert."