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Bumblebee

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Bumblebees are a diverse group of insects belonging to the genus Bombus. They are part of the Apidae family and the tribe Bombini.

Bumblebee heuchera
Bumblebee heuchera

There are over 250 different species within this genus. These insects are vital to our planet as agricultural pollinators. They help plants reproduce by moving pollen between flowers. However, many populations are currently declining in Europe, North America, and Asia. This decline is caused by habitat loss, pesticides, and the mechanization of agriculture.

Catastrophe for the bumblebees - geograph.org.uk - 899562
Catastrophe for the bumblebees - geograph.org.uk - 899562

Most bumblebees are eusocial insects that live in organized colonies. A single queen leads these groups, which are typically smaller than honeybee colonies. A nest might contain as few as 50 individuals. To survive, they use a specialized feeding mechanism. They possess a long, hairy tongue called a proboscis.

The bee uses this structure to lap up liquid nectar from flowers. During flight or rest, the proboscis folds neatly under the head. Some species even use capillary action to draw nectar up the tube. This allows them to reach food that other insects cannot access.

Bumblebees have several distinct types and specialized behaviors. Most are nest-making bees that collect resources for their young. These bees have a modified hind leg called a corbicula, or pollen basket. This is a shiny, bare area surrounded by a fringe of hairs used to transport pollen.

In contrast, cuckoo bumblebees are brood parasites. They do not build nests or form their own colonies. Instead, a cuckoo queen aggressively invades the nest of another species. She kills the resident queen and lays her own eggs. The resident workers then raise the cuckoo offspring. Because they do not collect pollen, cuckoo bumblebees lack the shiny pollen baskets found on other species.

History shows how our understanding of these insects has evolved. The genus name Bombus was introduced by Pierre André Latreille in 1802. The name comes from the Latin word for a buzzing or booming sound.

Moses Harris00
Moses Harris00

In 1859, Charles Darwin discussed them in his famous book, On the Origin of Species. He referred to them as "humble-bees" to highlight their role in pollinating wildflowers like clover. While the term "humblebee" was common in the nineteenth century, it was mostly replaced by "bumblebee" during the twentieth century.

2005. Марка России stamp hi12612325014b2ce1752cdd2
2005. Марка России stamp hi12612325014b2ce1752cdd2

Even literature has captured their charm, such as Beatrix Potter's 1910 character, Babbity Bumble.

Mrs tittlemouse
Mrs tittlemouse

Bumblebees possess unique physical traits for protection and survival. They are covered in soft, branched hairs called pile, which makes them appear fuzzy.

Bumble Bee in flight
Bumble Bee in flight

Their bright colors serve as aposematic coloration. This is a warning signal to predators that the bee can sting.

Bombus.barbutellus.-.lindsey
Bombus.barbutellus.-.lindsey

Many species use Müllerian mimicry, where different species evolve similar patterns for mutual protection. Some harmless insects, like hoverflies, use Batesian mimicry by looking like bumblebees to avoid being eaten. Sizes vary greatly across the genus. The largest species, B. dahlbomii from Chile, can grow as large as a flying mouse.

These insects are also masters of temperature regulation. This allows them to live in extreme environments like the Arctic tundra.

Vallhumla Hane06178
Vallhumla Hane06178

They use solar radiation to warm their bodies. They also use a process called heterothermy, where they shiver to generate internal heat.

To stay warm in cold climates, they employ countercurrent exchange to retain heat. In high-elevation areas with thin air, they increase their wing stroke amplitude to maintain flight. These adaptations allow them to occupy the northernmost boundaries of eusocial insect life.

Scientific study of bumblebee evolution is an ongoing process. The tribe Bombini is part of a larger group of corbiculate bees. This group includes honeybees, orchid bees, and stingless bees. Scientists have debated how social behavior evolved within this group. Some studies suggest sociality evolved twice, while newer genomic research supports a single origin.

Nest of the Common Humble-Bee Plate 15 Jardine
Nest of the Common Humble-Bee Plate 15 Jardine

Fossil evidence, such as Calyptapis florissantensis from the Eocene, helps researchers trace their long history. These studies help us understand how these essential pollinators fit into the complex web of life.

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🖼️ Images & Media (22)
File:Mrs tittlemouse.jpg
Mrs tittlemouse.jpg
File:Dehon et al 2019 Zookeys Fig2-D Bombus (Cullumanobombus) pristinus.jpg
Dehon et al 2019 Zookeys Fig2-D Bombus...
File:Dehon et al 2019 Zookeys Fig1-C Calyptapis florissantensis.jpg
Dehon et al 2019 Zookeys Fig1-C...
File:Bumblebee heuchera.jpg
Bumblebee heuchera.jpg
Yellowfaced lBumblebee foraging.webm
File:Bombus.barbutellus.-.lindsey.jpg
Bombus.barbutellus.-.lindsey.jpg
Bumblebees in rain.webm
File:Bumblebee nest.jpg
Bumblebee nest.jpg
File:Bumble bee nest hole.JPG
Bumble bee nest hole.JPG
File:Nest of the Common Humble-Bee Plate 15 Jardine.jpg
Nest of the Common Humble-Bee Plate 15 Jardine.jpg
File:Apoidea.jpg
Apoidea.jpg
File:Bombus soroeensis - Jasione montana - Tallinn.jpg
Bombus soroeensis - Jasione montana - Tallinn.jpg

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