Bee flies, part of the Bombyliidae family, are native flies that resemble the bumblebee. Similar to bumblebees, the flies have hairy brown, black or yellow bodies with long legs. They are typically quite large for flies, and their wings are spread out open when they rest. Their long proboscises (mouth organs) are ideal for probing the nectar from flowers. They also have great ability, like the hover fly, to hover in the air over a flower. The flies are also very agile, and move much faster than a bee. They produce a high-pitched sound when they fly.
As adults, bee flies are frequent floral visitors and are moderately good pollinators. They feed on the nectar of flowers and their furry bodies collect pollen well. The flies do not eat the pollen, but unknowingly transfer it to other flowers in their search for nectar.
The larvae of the bee fly act as parasites and feed on the immature (larva and grub) stages of various insects, including beetles, bees, wasps, butterflies/moths, caterpillars and the eggs of grasshoppers. The eggs will be laid in the insects' nests and when they hatch they begin to devour the young of the host.