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Everyone on the planet is likely to be familiar with the ubiquitous house fly (Musca domestica) belonging to the Muscidae family. These small, grayish flies measure about 4-7.5mm in length with distinctive four dark stripes on their thorax. House flies undergo complete metamorphosis with four life stages: egg, larva (maggot), pupa, and adult, through which the insect can progress in as little as 7-10 days under optimal conditions. Their large compound eyes providing nearly 360-degree vision, and one pair of functional wings with small knobbed structures called halteres for balance during flight make them agile flyers. |
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Before they feed, house flies taste with their feet, which are equipped with chemoreceptors that detect sugars, salts, and other chemicals.
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Adults possess a specialized mouthpart, the labella, for sponging up liquid food, and perform "vomit-feeding" by regurgitating digestive enzymes onto solid food to liquefy it, then lapping up the resulting solution.
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Their appetite for both animal waste and human food, accounts for why house flies can be effective vectors for various pathogens.
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House flies can carry over 100 pathogens harmful to humans, including salmonella and E. coli.
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- Their larvae, known as maggots, are efficient decomposers and play a role in breaking down organic waste.
- Female house flies can lay up to 500 eggs in their short lifetime (typically 15-30 days), which explains their remarkable population growth.
- A house fly's compound eyes contain approximately 4,000 individual lenses, providing exceptional motion detection but relatively poor image resolution.
- House flies can process visual information up to five times faster than humans, making it tricky to swat them.
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House flies beat their wings approximately 200 times per second, creating their characteristic buzzing sound.
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In ancient Egypt, representations of flies, sometimes of gold, in necklaces may have been used as protective amulets-- presumably against bothersome flies.
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The earliest known mechanical pest control device was the fly swatter, with ornate versions dating back to ancient Egypt, indicating humanity's long battle against these persistent insects.
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In Greek myth, the young girl, Myia, fell in love with Endymion but her chatter disturbed his eternal slumber, angering the moon goddess Selene, who transformed Myia into a fly, who, unfortunately, continues in incessant buzzing .
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The phrase "fly on the wall" derives from the house fly's ability to go unnoticed while observing human activities, becoming synonymous with witnessing events discreetly.
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Flies appear as metaphors in Shakespeare's plays, notably in King Lear ("As flies to wanton boys are we to the gods, they kill us for their sport").
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The title of William Golding's novel "Lord of the Flies," is a reference to Beelzebub, known by that sobriquet, originating from ancient Philistine worship-- later associated with demonology or even a representation of Satan, and thus, in Golding's work, invokes powerful associations with corruption and moral decay as social orders break down.
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- One of the closing images of the 1958 sci-fi/horror classic, The Fly, a tale of tragic teleporter trouble, is burned into the memories of many who saw the film in their impressionable youth
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There is a deep-seated instinct, in human males, to aim urine at targets. Amsterdam's Schiphol Airport famously features etched fly images in men's urinals, a behavioral design "nudge" created in the 1990s that reduced spillage by 80% by giving users a target to aim at—a simple innovation now widely copied worldwide as an elegant solution to a common problem. |
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Apis in a crapper:
Bugs in the biffy bowl is a long-standing tradition.
While flies are classified in the order Diptera, and honeybees and their kin, the wasps and ants, belong to the order Hymenoptera, in late-19th century Great Britain, people would put pictures of bees in urinals and toilets. They served as a target, but also a joke about the pronunciation of the honeybee's genus, Apis. And yes, in the late-19th century, a London plumbing impresario named Thomas Crapper, although he didn’t invent the flush toilet, improved the design and made a fortune with his line of flush toilets. (However, his name is not the root of our word "crap" which is derived from the Dutch for “to pluck”). |
Musca depicta (depicted fly) was a tradition of painting hyper-realistic flies on artworks, particularly common in 15th-17th century religious paintings and still lifes. These trompe l'oeil flies served multiple symbolic functions carrying significant philosophical and theological meaning within Renaissance and Baroque visual culture, including representing mortality (vanitas), sin, corruption, or the devil, while simultaneously showcasing the artist's technical virtuosity in creating convincing illusions. Notable examples include:
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Petrus Christus's "Portrait of a Carthusian" (1446) in which a fly appears to sit on the faux-frame painted around the portrait |
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Carlo Crivelli's "Madonna and Child" (1480), where a fly rests on the parapet below the Virgin Mary |
a portrait of a woman of the Hober family (1470?), subject and artist identities unknown, in which a fly appears to sit on the woman's wimple |
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Black soldier flies (Hermetia illucens) have emerged as a revolutionary solution in sustainable agriculture and waste management. Commercial facilities now cultivate these insects on an industrial scale, primarily focusing on their protein-rich larvae for animal feed production.The cultivation process begins with adult flies laying eggs in controlled environments. The resulting larvae are exceptionally efficient bioconverters, consuming organic waste including food scraps, agricultural residues, and even manure. Within just two weeks, larvae can increase their body weight by up to 5,000 times while simultaneously reducing waste volume by 50-80%. |
Automated black soldier fly breeding units house the larvae, which feed on organic waste that's added through the top. The clear collection tray at the bottom catches the mature larvae as they naturally migrate downward when ready to pupate - this is called "self-harvesting" and is one of the clever aspects of soldier fly farming. This circular economy approach addresses multiple challenges simultaneously: waste reduction, sustainable protein production, and renewable resource generation. Major companies worldwide are scaling up soldier fly operations, positioning this technology as a cornerstone of future food security and environmental sustainability. |
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Harvested larvae contain 35-45% protein and 15-35% fat, making them ideal for aquaculture, poultry, and pet food industries. The protein quality rivals traditional fishmeal and soybean meal, offering a sustainable alternative that reduces pressure on wild fish stocks and agricultural land. |
Beyond protein production, soldier fly farming generates valuable byproducts. The larvae's high fat content yields oil suitable for biodiesel production and soap manufacturing. Their frass (waste) creates nutrient-rich fertilizer with excellent soil conditioning properties. |
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House flies engage in what looks like hand-washing because they're actually cleaning their sensory organs, which are crucial for their survival. Their front legs are covered in tiny hairs and receptors that help them taste, smell, and detect chemical signals in their environment.
Flies use their legs to sample everything they land on - they can literally taste surfaces through their feet. When these sensory organs get clogged with dirt, debris, or other particles, it impairs their ability to find food, detect danger, or locate mates. The rubbing motion you see is them meticulously cleaning these receptors to keep them functioning at peak efficiency.
They also clean other body parts in a similar methodical way - you'll often see them rubbing their legs over their wings, head, and antennae. This grooming behavior is so important that flies will interrupt feeding to clean themselves, much like how we might pause to wipe our hands or clean our glasses.
The behavior is instinctive and constant because flies live in environments where they're constantly picking up contaminants. Their survival depends on having clean, functional sensory equipment, so what appears to be fastidious hygiene is actually essential maintenance of their most important survival tools.
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