What Do Insects See When They Look at You?

What do insects see when they look at you? A science documentary on insect vision, nature, and wildlife biology. How a bee, a mosquito and a fly build a picture of a human, and why bugs never see your face. In 1894, a physicist calculated that a compound eye sharp enough to resolve a human face would need a radius of six metres. Step seven metres back from a honeybee and your whole head becomes a single pixel. A mosquito cannot see you until it smells your breath. Then your skin lights up red-orange, at any pigmentation. And when you swing at a fly, nothing identifies you: A width is measured against a threshold shared by a locust, a frog, a fish, and a cat. In this video we go through what science knows about insect eyes: the physics that caps the resolution of every compound eye, why beekeepers wear white and what a guard bee thinks you are, the 300 Hz refresh rate that makes your hand arrive in slow motion, the sensory cascade a mosquito uses to find you (including the infrared channel found in 2024), and the bees and paper wasps that learn faces with a brain a millionth the size of yours. We also cover the part most videos leave out. Honeybees and Vespula wasps do not naturally recognise human faces, and there is no rigorous evidence a colony knows its beekeeper by sight. So what did those lab bees actually see? Why did insect colour vision evolve before flowers existed? And what happens to a moth when the brightest thing in its sky is your phone-lit face? Drop a comment: Has an insect ever reacted to you in a way that felt personal? ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SOURCES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ OPTICS & COLOUR — YOU AS A BLUR ▸ Mallock, A. (1894). "Insect sight and the defining power of composite eyes." Proc. R. Soc. London, 55: 85–90. ▸ Rigosi, E., et al. (2017). "Visual acuity of the honey bee retina and the limits for feature detection." Sci. Rep., 7: 45972. ▸ Millor, J., et al. (1999). "Self-organized defensive behavior in honeybees." PNAS, 96(22): 12611–12615. ▸ Alonso San Alberto, D., et al. (2022). "The olfactory gating of visual preferences to human skin and visible spectra in mosquitoes." Nat. Commun., 13: 555. SPEED & THE 33-DEGREE THRESHOLD ▸ Lafitte, A., et al. (2022). "A flashing light may not be that flashy: A systematic review on critical fusion frequencies." PLOS ONE, 17(12): e0279718. ▸ Card, G., & Dickinson, M. H. (2008). "Visually mediated motor planning in the escape response of Drosophila." Curr. Biol., 18(17): 1300–1307. ▸ von Reyn, C. R., et al. (2014). "A spike-timing mechanism for action selection." Nat. Neurosci., 17(7): 962–970. ▸ Fotowat, H., & Gabbiani, F. (2011). "Collision detection as a model for sensory-motor integration." Annu. Rev. Neurosci., 34: 1–19. THE MOSQUITO — HUNTING YOU ▸ van Breugel, F., et al. (2015). "Mosquitoes use vision to associate odor plumes with thermal targets." Curr. Biol., 25(16): 2123–2129. ▸ Chandel, A., et al. (2024). "Thermal infrared directs host-seeking behaviour in Aedes aegypti mosquitoes." Nature, 633(8030): 615–623. ▸ McBride, C. S., et al. (2014). "Evolution of mosquito preference for humans linked to an odorant receptor." Nature, 515: 222–227. FACES — BEES AND PAPER WASPS ▸ Dyer, A. G., Neumeyer, C., & Chittka, L. (2005). "Honeybee (Apis mellifera) vision can discriminate between and recognise images of human faces." J. Exp. Biol., 208(24): 4709–4714. ▸ Avarguès-Weber, A., et al. (2010). "Configural processing enables discrimination and categorization of face-like stimuli in honeybees." J. Exp. Biol., 213(4): 593–601. ▸ Tibbetts, E. A. (2002). "Visual signals of individual identity in the wasp Polistes fuscatus." Proc. R. Soc. B, 269(1499): 1423–1428. ▸ Sheehan, M. J., & Tibbetts, E. A. (2008). "Robust long-term social memories in a paper wasp." Curr. Biol., 18(18): R851–R852. ▸ Sheehan, M. J., & Tibbetts, E. A. (2011). "Specialized face learning is associated with individual recognition in paper wasps." Science, 334(6060): 1272–1275. ▸ Tibbetts, E. A., et al. (2021). "Individual recognition is associated with holistic face processing in Polistes paper wasps in a species-specific way." Proc. R. Soc. B, 288(1943): 20203010. DEEP TIME & THE SKY WE CHANGED ▸ Schoenemann, B., et al. (2017). "Structure and function of a compound eye, more than half a billion years old." PNAS, 114(51): 13489–13494. ▸ Dorin, A., et al. (2023). "Ancient insect vision tuned for flight among rocks and plants underpins natural flower colour diversity." Proc. R. Soc. B, 290(2013): 20232018. ▸ Fabian, S. T., et al. (2024). "Why flying insects gather at artificial light." Nat. Commun., 15: 689. ▸ Wagner, D. L., et al. (2021). "Insect decline in the Anthropocene: Death by a thousand cuts." PNAS, 118(2): e2023989118. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ For business inquiries: [email protected] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ #Insects #InsectVision #CompoundEye #Bees #Mosquitoes #Entomology #ScienceDocumentary #Biology #Nature