Even professional apiarists confuse carpenter bees and bumblebees. Nevertheless, there are clues that novice bee enthusiasts can rely on to help them properly distinguish these bees from each other. Known for their similar appearances, carpenter bees and bumblebees differ in notable ways.
To begin with, although they are both bees belonging to the same domain, kingdom, phylum, order, class, and family, carpenter bees and bumblebees have been grouped into separate subfamilies and, therefore, into different tribes, genera, and subgenera.
This only marks the beginning of their differences and explains much of why carpenter bees and bumblebees are quite distinct from each other, despite their similar appearance. In this article, we will discuss the key differences between carpenter bees and bumblebees, as well as provide clues on how to best differentiate them from each other.
Carpenter bees, pictured, build their nests in dead wood, stems, or pith, where they carve tunnels and galleries, whereas bumblebees live in burrows on the ground.
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At a Glance: Carpenter Bee vs. Bumblebee
| Carpenter Bee | Bumblebee | |
| Scientific Classification | Xylocopa spp. | Bombus spp. |
| Appearance | Segmented body (head, thorax, abdomen); smooth, shiny black abdomen; males have white or yellow faces; females have a bare corbicula (or pollen basket) | Segmented body (head, thorax, abdomen); plump and hairy; broad color bands or stripes, typically black and yellow; hairy corbicula (or pollen basket) |
| Behavior | Solitary bees; carve tunnels and galleries/compartments into wood for nesting | Communal or eusocial bees; build hives in abandoned burrows, rock piles or landscaping, and under vegetation |
Carpenter Bee vs. Bumblebee: The Key Differences
Carpenter Bee vs. Bumblebee: Scientific Classification
Carpenter bees and bumblebees share many characteristics, and their scientific classification—including domain Eukaryota, kingdom Animalia, phylum Arthropoda, class Insecta, order Hymenoptera, and family Apidae—reflect that. However, the point at which they diverge reveals some key differences between these two species, which this article will discuss.
For one, carpenter bees belong to the subfamily Xylocopinae, which is reserved for bees that nest in dead wood, stems, or pith and are solitary. Beyond subfamily, the bees of this classification are again divided into tribes. Large carpenter bees make up the Xylocopini tribe comprised of a single genus, Xylocopa, which includes some 500 known species in 31 subgenera.
Female carpenter bees and bumblebees, like the one pictured here, feature stingers that do not have barbs; this allows them to sting repeatedly.
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The subfamily Apinae, one of four in the family Apidae, contains bumblebees as well as honeybees, orchid bees, and stingless bees, among others. The bees of this subfamily nest in simple burrows on the ground and are both eusocial, meaning the bees live “in a cooperative group in which usually one female and several males are reproductively active and the nonbreeding individuals care for the young or protect and provide for the group,” and solitary. Bumblebees fall into the former category as do most bees in this subfamily.
Further classification places bumblebees in the tribe Bombini, which consists of large bristly bees in the single extant genus, Bombus. The term “bumblebee” refers to any of the estimated 250 species in the Bombus genus.
Carpenter Bee vs. Bumblebee: Appearance
A magnifying glass or microscope may be crucial to correctly identifying all the physiological differences between carpenter bees and bumblebees. Fortunately, there is one difference that is visible to the naked eye.
Each genus of bee, Xylocopa and Bombus, features a segmented body composed of the head, thorax or mid-section, and abdomen. On carpenter bees, the thorax is covered with a yellow fuzz in some species, and their abdomens are smooth, shiny, and black. Bumblebees, for their part, are hairy all over and primarily yellow and black, often in a striped pattern or color bands. The position of the yellow and black (and sometimes white) coloring can vary dramatically depending on the bees’ geographic location, as this species’ visual guide from the University of Wisconsin-Madison shows.
Carpenter bees’ genus name comes from the Greek term for “woodcutter.”
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Carpenter Bee vs. Bumblebee: Behavior
The differences in behavior between carpenter bees and bumblebees are evident in their respective scientific classifications as well: where they nest and how they live among other bees of their species.
Large carpenter bees earned their genus name, Xylocopa, a New Latin term taken from the Greek word for “woodcutter,” because of how precisely and perfectly they bore rounded tunnels and galleries or compartments inside dead (not decayed) tree limbs or trunks. Some may occasionally find fence posts or other wooden structures inviting places to establish nests, becoming a nuisance in the process.
Living in these wooden nests are often several generations of mothers and daughters, as these bees can live for up to three years; however, carpenter bees do not have castes or queen bees. Socially, they are solitary bees. In other words, they do not build hives, produce honey, or live communally. In these ways, carpenter bees differ dramatically from bumblebees.
The buzzing of bumblebees inspired their genus name, Bombus, and one of the most famous “riffs” in music history, “The Flight of the Bumblebee.” Since at least 1677, the word “bombus” has referred to the “buzzing, humming, or droning noise likened to the sound made by bees.” Bumblebees live in burrows left by other animals in habitats like farmland and open fields, which offer the ideal places for these bees to build their colonies, which can comprise between 50 and 400 bees.
Compared to carpenter bees, bumblebees are the social butterflies of the bee world. They are noted for their “eusociality,” although it’s considered primitive compared to honeybees. According to The Insect Societies by Edward O. Wilson, the following four characteristics are found in eusocial animals: adults live in groups, cooperative care of juveniles (individuals care for brood that is not their own), reproductive division of labor (not all individuals get to reproduce), and overlap of generations.
Bumblebees form colonies around a queen bee. The Penn State Extension website offers an in-depth explanation of the bumblebee lifecycle. It begins in spring, when the queen emerges from underground alcoves where they shelter over the winter. After loading up on pollen and nectar, she begins laying eggs in what is understood to be the social phase of the colony.
Bumblebees live together in family groups in a nest ruled by a queen who is helped by her daughters called worker bees.
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By summer, the queen is in full-on baby bee–making mode during the pre-competition phase, emitting a pheromone that prevents other females from reproducing. The nurse workers feed the queen’s brood, and foraging workers keep the colony adequately supplied with pollen and nectar. At this point, the queen is laying fertilized eggs, which produce only female offspring.
In the fall, or competition phase of the lifecycle, according to Penn State’s website, queen bees “cease worker production and begin laying unfertilized eggs, which develop into drones, or male bumble bees. Nurse workers help rear the remaining fertilized eggs into new queens. Once queens stop laying reproductives (gynes and males), workers may start to lay their unfertilized eggs.” Old queens die, new queens leave the colony to start their own. Winter brings the diapause phase, an arrested state of development and behavior that lasts for 6-9 months. It’s similar to hibernation in mammals. At the conclusion of this phase, the social phase begins anew.
