Honey Bee Anatomy: Five Eyes, Pollen Baskets, Barbed Stinger and How a Honey Bee Compares to a Wasp

Honey bee anatomy is built around two requirements: collect nectar and pollen from millions of flowers each season, and defend a colony of 50,000 sisters against larger animals at the cost of single workers’ lives. The Western honey bee (Apis mellifera) is 12 to 20 mm long depending on caste, carries five eyes (two large compound eyes plus three simple ocelli on top of the head), four wings locked into one flight surface by tiny hooks, and a barbed stinger that anchors so firmly in mammal skin that the worker tears its own abdomen out to escape.

Every part of the bee, from the branched body hairs that collect pollen by static charge to the honey stomach that carries 80 mg of nectar back to the hive, is shaped by life inside a social colony.

Download large honey bee anatomy diagram here.

The genus Apis contains 8 living species, including the Western honey bee, the Eastern (Asian) honey bee (Apis cerana), the giant honey bee, and the dwarf honey bee. Each colony contains three castes built on the same body plan but tuned to different jobs. A queen is a long-bodied egg-laying female, 18 to 20 mm long, and lives 2 to 5 years.

Workers are sterile females, 12 to 15 mm, and live 6 weeks in summer or up to 6 months over winter. Drones are males, 15 to 17 mm, with the largest eyes of the three castes (their job is to find a queen mid-air during her mating flight) and no stinger at all. The descriptions below focus on the worker, the caste most people see foraging on flowers.

Honey Bee Body Size and Three Body Sections

An adult worker honey bee measures 12 to 15 mm (around half an inch) from head to abdomen tip and weighs about 100 mg. The body is divided into the three insect sections: head, thorax, and abdomen. The head is wider than tall and carries the eyes, antennae, and mouthparts. The thorax sits behind the head and carries every muscle the bee uses to fly or walk: it anchors the four wings on top and the six legs underneath. The abdomen is the longest section and contains most of the internal organs, including the honey stomach, the digestive tract, the wax glands, and the venom sac and stinger.

A thin waist (the petiole) joins the thorax to the abdomen and gives the bee enough flexibility to curl the abdomen forward to sting an opponent or to deposit eggs in a comb cell. The whole body is covered in branched hairs, an unusual feature even among insects: each hair is feathered like a bird’s down, and the branched structure traps pollen grains on contact. A single foraging trip can leave a worker dusted with pollen across the head, thorax, abdomen, and legs, all of which the bee combs into the pollen baskets on its hind legs before flying home.

Five Eyes and the Compound View of the World

A worker honey bee has five eyes. Two large compound eyes occupy most of the side of the head, each made of around 6,900 separate optical units called ommatidia. Each ommatidium has its own lens and photoreceptors and faces in a slightly different direction; the bee’s brain stitches the 6,900 inputs into a single low-resolution image with a wide field of view and excellent motion detection. Drones carry around 8,600 ommatidia per eye, and the two compound eyes touch on top of the head, an enlargement tied to one job: spotting and chasing a queen during her mating flight up to 30 m above the ground.

Three small simple eyes called ocelli sit in a triangle on top of the head between the compound eyes. The ocelli do not form images. They detect overall light intensity and the polarisation pattern of skylight, which the bee uses to keep horizon level during flight and to navigate by sun position even when the sun is hidden behind clouds. Honey bee colour vision spans ultraviolet, blue, and green; bees cannot see red. Many flowers carry ultraviolet “nectar guide” patterns on their petals, invisible to humans, that point a foraging bee toward the centre of the flower like the runway lights at an airport.

Head: Antennae and Mouthparts

Two antennae project forward from the front of the head. A worker antenna has 12 segments (a drone has 13) and carries thousands of tiny sensors. About 170 olfactory receptor genes are expressed on the antenna, giving the bee a sense of smell sharper than a dog’s for floral and pheromone scents. A specialised cluster called Johnston’s organ at the second segment detects vibration and air-borne sound, which is how a worker decodes the dance language of returning foragers in the dark of the hive.

The mouthparts combine biting and sucking in a single set, an arrangement found in few other insects. A pair of hard mandibles at the front bite into wax, knead the comb into shape, chew through cell cappings, and grip rivals during fights between queens. Behind the mandibles, a long flexible proboscis built from the labium and the maxillae folds out and reaches 5 to 7 mm forward to suck nectar from inside flower corollas. The proboscis is grooved to channel liquid up into the mouth by capillary action and muscular pumping, then folds back under the head when the bee is not feeding.

Thorax: Four Wings Locked into One Flight Surface

A honey bee has four wings, in two pairs: the larger forewings on the front of the thorax and the smaller hindwings behind. During flight the two wings on each side lock together into a single flight surface using a row of 17 to 25 small hooks called hamuli on the leading edge of each hindwing, which catch onto a folded ridge on the trailing edge of the forewing. The hamulus connection holds the wings as one and unzips when the bee folds them flat over its back at rest. Wing strokes run at around 230 beats per second in cruising flight, the source of the bee’s hum.

The flight muscles of the thorax are not connected to the wings as the muscles of a bird are connected to a wing bone. Instead they distort the shape of the thorax itself, and the wings are levered up and down by that deformation, a trick called indirect flight muscle that lets the wings beat much faster than a nerve impulse can fire. The thorax also generates so much heat during flight that a hovering bee runs at 35 to 40 degrees Celsius (95 to 104 F) at the muscles, around 5 to 10 degrees above ambient on a warm day, and clusters of winter bees pool their thoracic warmth to keep the queen above 32 degrees C inside the hive even when outside temperatures fall below freezing.

Six Legs and the Pollen Basket

The thorax carries six legs in three pairs. Each pair handles a different job and carries different specialised tools. The forelegs have a semicircular notch on the inside of the first tarsal segment lined with stiff bristles: an antenna cleaner. The bee draws each antenna through this notch one at a time to wipe pollen, dust, and debris off the chemoreceptors. The middle legs carry a small spur on the tibia used to lift wax from the abdominal glands and to dislodge pollen pellets at the hive.

The hind legs carry the most distinctive structure on the bee’s body: the corbicula, or pollen basket. On the outside of each hind tibia sits a flat, polished, slightly concave area surrounded by a fringe of long, curved hairs. A foraging worker combs pollen off her body using brushes on the front and middle legs, mixes it with a drop of regurgitated nectar, and packs the moistened mass into the corbicula. A loaded basket can hold around 15 mg of pollen, about 15 percent of the bee’s body weight; the two baskets together let a worker fly home with 30 mg per trip. The corbicula is found only in the honey bees, bumble bees, stingless bees, and orchid bees (the four corbiculate tribes); other bees and all wasps lack it.

The Barbed Stinger and Worker Death

The stinger sits at the tip of a worker’s abdomen and is a modified ovipositor (egg-laying tube) inherited from the bee’s wasp ancestors. Worker bees are sterile and use the structure for defence rather than reproduction. The stinger consists of two grooved lancets that slide past each other in turns to drive the venom barb deeper into the target with each movement, plus a venom sac that contracts to inject venom even after the bee has flown away. Each lancet carries 9 or 10 backward-facing barbs along the outer edge.

Against another insect with a thin cuticle, the barbs slide back out as the bee withdraws, and the worker can sting again. Against the thicker, more elastic skin of a mammal, the barbs lock in place. As the bee tries to fly away, the stinger, venom sac, attached muscles, and a section of the abdomen tear out of her body and stay anchored in the wound. The worker dies within minutes from the abdominal damage, but the autotomised venom apparatus continues to pump venom into the target for around a minute after detachment, doubling the dose. Honey bee venom contains around 50 percent melittin, the peptide responsible for most of the pain and tissue damage of a bee sting. The queen’s stinger is smooth and curved; she can sting many times and uses it almost only against rival queens during a colony succession. Drones have no stinger at all.

Internal Anatomy: Honey Stomach, Tracheae, and Wax Glands

The abdomen contains most of the bee’s internal organs. A long tube along the dorsal midline acts as the heart, with five contractile chambers that pump haemolymph (insect blood) forward through the body cavity. The bee has no closed circulatory system: haemolymph bathes the organs and tissues. Breathing happens through 10 paired spiracles down the side of the body that open into a network of branching tracheae, which carry oxygen straight to each tissue without passing through the blood at all. The same network expels carbon dioxide. Bees do not have lungs.

The digestive tract has a unique addition for a flying nectar collector. In front of the proper stomach sits the honey stomach (also called the crop), a thin-walled sac that holds up to 80 mg of nectar, almost the worker’s whole body weight. Nectar carried in the honey stomach does not mix with the bee’s own digestion; a one-way valve called the proventriculus separates the two compartments. Back at the hive, the worker regurgitates the load to other workers, who dehydrate it through repeated mouthparts-to-mouthparts transfer and add enzymes that turn nectar sucrose into honey. Wax glands sit on the underside of the worker’s abdomen on segments 4, 5, 6, and 7, two glands per segment for a total of eight. Each gland secretes a thin scale of beeswax through the cuticle; the worker scrapes it off with a hind leg, kneads it with the mandibles, and adds it to the comb.

Honey Bee vs Wasp: Anatomy Comparison

Honey bees and wasps are close relatives within the order Hymenoptera and share many features: three body sections, two pairs of wings, six legs, a venom sac and stinger, and a complex social structure (in some species). They diverge across diet, body covering, leg specialisation, and stinger geometry. The differences trace back to a single ecological split: honey bees evolved from predatory wasp ancestors into pollen-and-nectar specialists, and reshaped the body for that diet.

For more on bee species, see our Honey Bee profile, plus the Honey Bee Characteristics page, the broader Bees overview, and pages on Bumble Bees, Africanized Bees, Solitary Bees, and Stingless Bees. For practical guides, see Bee Swarms and the Bee Safety guide. For comparable insect anatomy, see Wasp Anatomy, Ant Anatomy, Butterfly Anatomy, Dragonfly Anatomy, and Ladybird Anatomy, or browse the full Animal Anatomy hub.

Sources & References

• IUCN Red List, Apis mellifera
• USDA, Honey Bees
• Smithsonian’s National Zoo, Honey Bee
• Animal Diversity Web, Apis mellifera
• Wikipedia, Honey bee