I Think I'm Being Invaded by Hover Flies in my Garden!

Hover flies hang in the air at eye level, hold perfectly still, and dart off the second you move — then come right back. If your garden's been "invaded" by little hovering insects this season, you're not being watched by tiny drones. You're watching hover flies.

This episode is a short, close look at one of the world's most underappreciated pollinators: the fly that wears a bee costume. Why they hover exactly where they do, how they hold that impossible mid-air stillness, why one is parked right next to you — and the strange double life that makes them quietly valuable in any garden. No equipment, no field trip. Just you, standing still for a minute, learning to see what's already there.

www.secretpollinators.com

KEY SOURCES

Hovering, territoriality & flight control

• • Collett & Land (1975). Visual control of flight behaviour in the hoverfly Syritta pipiens. Journal of Comparative Physiology. — station-taking, territoriality, male vs. female hovering function.
  • Nicholas et al. / eLife (2026 reviewed preprint). Sexual dimorphism in sensorimotor transformation of optic flow. https://elifesciences.org/reviewed-preprints/109795v2 — males hold territories from a hovering stance, then high-speed pursuit.
  • Hoverfly (Eristalis tenax) pursuit of artificial targets. PMC10088529. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10088529/ — male pursuit behavior from hovering stance.
  • Pringle, J.W.S. (1948). The gyroscopic mechanism of the halteres of Diptera. Philosophical Transactions of the Royal Society B 233(602): 347–384. DOI: 10.1098/rstb.1948.0007 — foundational paper establishing halteres as gyroscopic angular-rate sensors. (Confirmed; classic primary source. Halteres named generically on air as "tiny knobbed organs"/"drumsticks" — no Latin spoken.)

Male/female hovering function (plain-language corroboration)

• • UC Marin Master Gardeners: male hovering = territorial display while seeking females; female hovering = searching oviposition sites. (Extension source — corroborates primary literature above; used as lead, not sole citation.)

Pollination importance

• • Rader et al. (2016), PNAS — non-bee insects (incl. Syrphidae) as crop pollinators; basis of "second most important after bees" framing.
  • Doyle et al. (2020) — Diptera as second most important pollinating insect group; Syrphidae as dominant fly visitors.
  • Flower visitation by hoverflies in a temperate plant–pollinator network. PMC6282941. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6282941/
  • Frontiers in Plant Science (2023): Eupeodes corollae provides pollination + aphid biocontrol; Syrphinae larvae prey on aphids and other soft-bodied herbivores. https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1118388/full

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