How Many Eyes Do Bees Have? Five, Like Fingers on a Hand

Bees typically have five eyes: two large compound eyes at the sides of the head and three small simple eyes, called ocelli, arranged in a triangle on top.

Where are a bee's five eyes?

Look at a bee from the front and the two compound eyes are the dark, oval panels flanking its face. They curve around the sides, giving the bee a broad view while it flies. The other three can disappear among the hairs. Those are the ocelli: one median ocellus in front and two lateral ocelli behind it.

“Five eyes” is accurate only when eye serves as the shelf label for two rather different organs. I have kept an ingredient distributor's sample library outside Trieste for nearly a quarter-century, and its 3,000 jars often need both the supplier's name and the name anybody would use. In the quiet after this morning's rush, the useful labels here are compound eye for each large side eye and ocellus for each small top eye. Ocelli is simply the plural of ocellus.

The 2013 PLOS ONE study by Martin Streinzer, Axel Brockmann, Narayanappa Nagaraja, and Johannes Spaethe examined five honey bee species. It recorded the same arrangement in queens, workers, and drones: two compound eyes and three ocelli. Caste changes the equipment's proportions, though it does not change five into another number.

What does each type of bee eye do?

The compound eyes handle the detailed visual world a flying bee must use: patterns, flower colors, landmarks, movement, and the flow of the scene as the bee passes through it. Each compound eye is a close-packed field of hexagonal units called ommatidia. Every ommatidium receives light from a narrow part of the scene, and the nervous system combines their signals.

That does not mean a bee watches thousands of separate little pictures, a common cartoon explanation. An ommatidium is a sampling unit. A better comparison is a digital image made from many pixels, with one caution: a bee's curved eye and nervous system work very differently from a flat phone camera.

The ocelli gather light through one lens apiece. Their images are coarse because the focal plane lies behind the retina. Yu-Shan Hung and Michael Ibbotson's 2014 study of honey bee ocelli found something more useful than a vague claim that they merely “sense light.” The dorsal parts of the ocellar retinas view the horizon; the ventral parts view the sky. The authors connect that layout with attitude control, the adjustments that help a bee keep the right orientation in flight.

The same study describes ocelli as sensitive detectors of overall illumination across a wide field. They can carry some broad spatial information, especially from large light-dark patterns, yet they are poor tools for inspecting a petal's fine edge. Compound eyes answer “what is around me and how is it moving?” Ocelli rapidly report the light overhead and the relationship between sky and horizon.

How many ommatidia are in each compound eye?

A worker Western honey bee (Apis mellifera) has an average of 5,375 ommatidia in each compound eye, according to Streinzer and colleagues' microscope measurements. Across both compound eyes, that is roughly 10,750 light-sampling units. The study reported 5,375 ± 143 because individuals differed; 5,375 is a measured mean, rather than a magic number carried by every worker.

The same source counted an average of 4,460 ± 55 ommatidia per compound eye in queens and 9,993 ± 483 in drones. That last figure is striking. A male's compound eyes are enlarged and meet near the top of the head, an arrangement associated with finding queens during mating flights. More facets can improve sampling without turning the bee's sight into human-style high-definition vision.

A 2025 iScience study by Alexandre Durand and colleagues summarizes the broader literature as about 5,300 ommatidia for workers, 4,600 for queens, and 9,900 for drones. It also reports nine photoreceptor cells in a typical worker ommatidium. If two reliable papers offer slightly different labels on the jar, check their samples and rounding. Here, they describe the same caste pattern.

How small are the three ocelli?

On a worker Western honey bee, the longest span across the median ocellus averages 0.30 ± 0.01 millimeters; a lateral ocellus averages 0.28 ± 0.01 millimeters. Those are Streinzer and colleagues' calibrated microscope measurements, taken as the longest line across each lens. A single ocellus is therefore easy to mistake for a shiny speck among the hairs.

Size follows a bee's way of life as well as its species. In the same five-species study, worker median ocelli ranged from 0.19 millimeters in the black dwarf honey bee (Apis andreniformis) to 0.40 millimeters in the giant honey bee (Apis dorsata). The count stayed at three; the little skylights changed size.

An even stronger night-flying comparison comes from Sajesh Vijayan and colleagues' 2023 Proceedings of the Royal Society B paper. It reports an ocellus diameter of 0.95 ± 0.07 millimeters in the nocturnal carpenter bee Xylocopa tranquebarica. A larger opening admits more light, which is valuable when photons are scarce.

What wavelengths can bee eyes detect?

Honey bee color vision spans about 300 to 650 nanometers. Frank Sommerlandt, Johannes Spaethe, Wolfgang Rössler, and Adrian Dyer give that perceptual range in their 2016 PLOS ONE study. It reaches into ultraviolet, which human eyes cannot see, and stops before the deep-red region that humans can see.

Within that range, the compound eyes use three main photoreceptor classes. Durand and colleagues' 2025 iScience paper gives sensitivity peaks of 344 nanometers for ultraviolet receptors, 436 nanometers for blue receptors, and 544 nanometers for green receptors. A peak is the wavelength that stimulates a receptor most strongly; it is not a hard border around a single color.

This is why “bees cannot see red” needs care. A pure long-wavelength red surface may give little chromatic signal to a honey bee, but many red flowers reflect ultraviolet, contain shorter-wavelength patterns, or stand out by brightness. The bee responds to the light reaching its receptors, not to the color name printed on a seed packet.

Do different bee species have different numbers of eyes?

The standard adult bee plan is five eyes. Species differ far more in eye size and facet number than in the two-compound-plus-three-ocelli count. Streinzer and colleagues measured the following workers under one method, so the comparison does not mix estimates from unrelated procedures:

| Honey bee species | Total adult eyes | Ommatidia per compound eye | Median ocellus, longest span | |---|---:|---:|---:| | Black dwarf honey bee (Apis andreniformis) | 5 | 3,851 ± 110 | 0.19 ± 0.01 mm | | Red dwarf honey bee (Apis florea) | 5 | 4,394 ± 29 | 0.20 ± 0.00 mm | | Asian honey bee (Apis cerana) | 5 | 4,921 ± 88 | 0.25 ± 0.01 mm | | Western honey bee (Apis mellifera) | 5 | 5,375 ± 143 | 0.30 ± 0.01 mm | | Giant honey bee (Apis dorsata) | 5 | 5,974 ± 112 | 0.40 ± 0.02 mm |

The table's repeated five is the answer to the species-specific count for these honey bees. The changing columns explain why one should never infer equal vision from equal eye count. Vijayan and colleagues, for example, measured 18,804 facets in each compound eye of the nocturnal carpenter bee Xylocopa tranquebarica, more than three times the worker A. mellifera mean in the table.

Bumble bees also follow the five-eye plan. A 2024 Ecology and Evolution study by Pierre Tichit and colleagues quantified the compound eyes and all three ocelli in 20 bumblebee species. Across those species, the basic parts list stayed recognizable while facet number, eye geometry, and ocellar alignment varied.

How are bee eyes different from spider eyes?

Most spiders have eight eyes, arranged as four pairs, while a bee typically has five. The resemblance ends with the word eye. A 2025 Proceedings of the Royal Society B study led by Luis Baudouin Gonzalez describes the usual spider set as one pair of principal eyes and three pairs of secondary eyes. The paper also warns that eye number, size, position, and function vary greatly among spider lineages.

A spider's eyes are single-aperture, camera-type organs. Its principal pair may form sharp images; other pairs often widen the field of view or detect motion, depending on the species. A bee instead combines two many-faceted compound eyes with three single-lens ocelli. One bee compound eye contains thousands of optical units under its faceted surface. One spider eye does not.

So the joke answer “a spider wins, eight to five” counts organs and misses the biology. A jumping spider uses a set of separate camera eyes for the visual problems of a hunter. A bee uses a pair of curved mosaics for flight and flowers, backed by three small sensors aimed toward sky and horizon. Eight and five describe arrangements, not a scoreboard for better sight.

Can a bee use all five eyes at night?

The five eyes remain present after dark; the useful question is whether enough light reaches them. Western honey bees are mainly daytime foragers, and the 2023 study by Vijayan and colleagues notes that Apis mellifera loses color discrimination around twilight. Its eyes still detect visual information, but darkness reduces what can be resolved.

Other bees stretch the same basic equipment much further. Vijayan's team trained freely flying giant honey bees, Apis dorsata, to choose colors and found that they could discriminate the trained color at roughly half-moon illumination, about 10⁻² candela per square meter. The nocturnal carpenter bee Xylocopa tranquebarica has demonstrated color vision at starlight levels.

The difference is built partly into scale: X. tranquebarica has larger compound eyes, wider facets, and those 0.95-millimeter ocelli. Neural processing can also pool signals across space or time, trading fine detail or speed for sensitivity. Night changes the amount of usable light. It does not subtract eyes from the bee's head.

What else do people ask about bee eyes?

Why do bumble bees have five eyes?

Bumble bees have five eyes because two visual systems share the head: two compound eyes at the sides and three ocelli on top. Tichit and colleagues' 2024 study quantified both systems across 20 bumblebee species. Compound eyes sample patterns and movement; ocelli gather broad information about sky and horizon.

How many honey bees have eyes?

Every normally developed adult honey bee—worker, queen, or drone—has eyes, and each has five: two compound eyes plus three ocelli. In Western honey bees, the count stays constant across castes while the facets differ: Streinzer's 2013 measurements averaged 5,375 per compound eye in workers and 9,993 in drones.

Do bees have a heart?

Yes. A bee has a tubular heart along the back of its abdomen. Arizona State University's Ask A Biologist anatomy guide explains that it pumps hemolymph through an open circulatory system, so the fluid is not confined to veins and arteries. An aorta carries hemolymph forward from the heart.

How many eyes do bees have at night?

A bee still has five eyes at night: two compound eyes and three ocelli. Darkness changes performance, not anatomy. Western honey bees lose color discrimination near twilight, while Vijayan's 2023 experiments found that giant honey bees could distinguish a trained color at light levels similar to a half moon.

How many eyes does a queen bee have?

A queen bee has five eyes: two compound eyes and three ocelli. Her eye count matches a worker's and a drone's, though the compound eyes contain different numbers of facets. Streinzer's study counted an average of 4,460 ommatidia per compound eye in Western honey bee queens.

What do bee ocelli detect?

Bee ocelli detect broad changes in illumination and coarse light-dark structure across the sky and horizon. Hung and Ibbotson's honey bee study found that dorsal ocellar retinas view the horizon while ventral regions view the sky, a layout linked to flight attitude control. They do not provide detailed flower images.