How they see
How does a honeybee see the world?
Sees UV flower guides, blind to red
A honeybee reads a flower like a landing chart rather than a picture. Its world is built from ultraviolet, blue and green, with no red receptor at all, so a red poppy looks nearly black. Many pale blooms, by contrast, reveal glowing ultraviolet bullseyes that steer the bee straight to the nectar. The image is coarse, but it is exactly the image a forager needs.
See through their eyes
Human ≈ 60 cpd (20/10)
How sharp is a honeybee's vision?
Its eyes resolve about 0.25 cycles per degree (20/2400), while a human reaches around 60 cpd (20/10). Its field of view spans about 280°.
How does a honeybee see a human?
Its eyes resolve about 0.25 cycles per degree against your 60, so a face has to be roughly 240 times closer for it to pick out the detail you do. Your outline and your movement read clearly; your expression does not.
Colour comparison
How each colour shifts when seen through this animal's eyes, using the same colour model as the app. Tones a screen can't emit (such as ultraviolet) are shown as an approximation.
What colours can a honeybee see?
UV–blue–green colour vision. Red appears dark/black; flowers reveal hidden UV bullseye patterns.
Photoreceptors
Trichromat shifted to UV (no red receptor), compound eyes
Cone peak sensitivities
- UV344 nm
- Blue436 nm
- Green544 nm
How does a honeybee see in the dark?
Day-active; poor in dim light.
How does a honeybee's vision compare to a human's?
A bee's spatial detail, around 20/2400, is far coarser than your 20/20, and it is blind to red. In return it sees ultraviolet you cannot, and its eyes refresh so fast, near 200 times a second, that motion you read as a blur is spread out clearly for the bee.
What is special about a honeybee's vision?
- Sees ultraviolet nectar guides
- Blind to red
- Flicker fusion ~200 Hz — sees fast motion in slow-mo
What the research shows
The bee's three receptor types were first pinned down by Autrum & von Zwehl (1964), who recorded the spectral sensitivity of individual photoreceptor cells. Later comparative work by Peitsch et al. (1992), and the review by Menzel & Backhaus (1991), set the peaks at about 344 nm in the ultraviolet, 436 nm in the blue and 544–556 nm in the green. With no red receptor, long-wave red registers as dark rather than as a hue, and the most useful colour distinctions for a bee fall in the blue-green. Receptors in the dorsal rim area, along the upper edge of the eye, are specialised for polarised ultraviolet skylight and act as a sky compass.
Spatial resolution is set by the compound eye's optics, with ommatidia about 1–2 degrees apart, and it has been measured behaviourally. Srinivasan & Lehrer (1988) found that bees' performance fell off above about 0.25 cpd, reaching chance at about 0.34 cpd. The page uses 0.25 cpd, roughly 20/2400. Temporal resolution runs the other way, with flicker fusion estimated at about 165–300 Hz, and the page shows 200 Hz. An ordinary screen cannot emit ultraviolet or polarisation, and a phone camera does not record them, so any UV cue is a false-colour stand-in. A display built around human flicker perception also cannot convey how finely a bee's eye divides time.
Guides: Animals that see ultraviolet · Which animal has the best eyesight? · All guides
Scientific sources
- Peitsch et al. (1992)
- Menzel & Backhaus (1991)
- Srinivasan & Lehrer (1988)
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