Bee flies get their common and scientific names from their resemblance to several different species of bees. However, if you look closely you can tell they have only one pair of wings, and their antennae are entirely wrong for a bee. Unlike bumblebees, they're fast - really fast and agile, with great ability to hover, like syrphid flies.

While adult Bombylius feed on nectar from early spring flowers (and carry pollen, which they don't eat, on their fur), the larvae are parasitoids or predators on bee larvae. And now you know the shocking truth - Bombylius are out so early so they can stash their eggs in the open tunnels of solitary bees while they are still being provisioned and before they get sealed up. When the female solitary bee goes in search of more pollen, the Bombylius hovers at the opening of the burrow. While still hovering, she ejects an egg inside the tunnel with a flick of her abdomen.