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Many bat flies, on the other hand, look like spiders, such as those in the images above. They spend most of their lives nestled in the fur of bats, subsisting on their blood. Some of these flies have evolved to be wingless, whereas others ditch their wings and have bats fly for them. (These are the flies that don’t lay eggs like other insects but rather give birth to a single live larva.)

Another impressive spider-lookalike is a rare fly in Kenya known as the terrible hairy fly, shown below. Their larvae are known to live in and eat bat poop.

 R. Copeland/International Centre of Insect Physiology and Ecology
Terrible hairy flies, known by the scientific name, Mormotomyia hirsuta.

One more: Females in a genus of Phorids called Vestigipoda mimic ant larvae. Their disguise is so convincing that ants feed the flies as if they were their own young. “They look like things that you would never recognize as flies,” Hartop said.

The flies with weird appendages and body parts

Other flies just look totally bizarre.

 The Trustees of the Natural History Museum, London
A stalk-eyed fly native to New Guinea.

My favorite? The stalk-eyed fly. In males, the eyes are on the ends of thin stalks that can be longer than their bodies. These eyes function a bit like moose antlers or sheep horns; the flies likely use them to assert dominance, according to the Natural History Museum, London.

Flies in the family Pipunculidae also have remarkable eyes. They’re enormous. Their whole head is basically just eyes. Unlike humans and other mammals, flies have compound eyes made of multiple light-detecting parts; those eyes see in low resolution but are exceptionally good at detecting sudden movements.

 Getty Images
A “big-headed” fly in the family Pipunculidae.

Another fly, called Moegistorhynchus longirostris, also has an impressive body part: a proboscis that can be longer than 8 centimeters, or about 3 inches. The fly itself, meanwhile, is only about 1 centimeter long. The flies use these appendages to reach the nectar in tube flowers.

 David Barraclough and Rob Slotow/African Invertebrates (Image by C. Patterson-Jones)
A fly called Moegistorhynchus longirostris that has an incredibly long proboscis.

Perhaps even more wonderful (and ingenious) are a handful of cave-dwelling gnat species in the genus Arachnocampa. As larvae, they glow to make their own bug traps. Their luminescence draws in moths and other insects, which then get ensnared by sticky threads that the gnats produce, McAlister said. The larvae then eat them.

 Moritz Wolf/Getty Images
Gooey threads created by larvae of the fungus gnat, Arachnocampa luminosa, in a cave in New Zealand.

Flies pollinate our plants and clean up our shit

Flies are cool, yes. But are they important? Also, yes.

It’s true that some flies are extremely harmful to humans, including female mosquitos in the genus Anopheles. They transmit malaria, which kills several hundred thousand people each year. Other varieties, like tsetse flies, also carry parasites that can be painful and sometimes deadly. These are very serious concerns.

 Getty Images
A female tsetse fly.

Yet only a tiny fraction of the world’s flies harm us. We depend on many of the rest.

For example, flies are fundamental to the production of many of our favorite foods, such as chocolate, McAlister said. While roughly two dozen insects are known to pollinate cacao plants — the seeds of which are used to make chocolate — nearly all of them are flies, she said. So no flies, no chocolate.

Did you know? We wouldn’t have Chocolate if it weren’t for insects? The Chocolate Midge #fly (Theobroma cacao) is the main pollinator of the cacao plant. No chocolate if it weren’t for this little fly! #SaveInsects #NatureEducation pic.twitter.com/mII0agD3id

— Dr. Akito Kawahara (@Dr_Akito) April 30, 2021

Altogether, more than 100 cultivated crops are largely dependent on flies for pollination, including mangos, cashews, and avocados.

Some flies can also help farmers and home gardeners deal with pests. The larvae of some hoverflies, for example, have a voracious appetite for aphids, small insects that infest crops. (If you buy organic produce, chances are you’ve encountered, or accidentally eaten, aphids.)

“We massively underestimate the impact these tiny little creatures are having,” McAlister said.

Gross as they look, fly larvae also help clean the world of waste — they eat our garbage, our roadkill, and our feces. None is perhaps more impressive than rat-tailed maggots, the larvae of certain kinds of hoverflies. On one end of their body, they have an extendable “breathing siphon” that functions like a snorkel, allowing the maggot to feed in a pile of waste even if it’s deprived of oxygen. “These things scuba dive,” McAlister said.

 The Trustees of the Natural History Museum, London
A rat-tailed maggot, the larva of a certain kind of hover fly. The thin strand that looks like pulled cheese is a snorkel-like tube it can use to breathe.

Yet we know very little about them

Considering flies are fascinating, important, ubiquitous, and in some cases cute, you might think everyone would be jumping at the opportunity to study them.

They are not.

Aside from pathogen-carrying mosquitos, flies are a massively under-studied group of organisms, in part because science tends to focus more on conventionally charming insects, Hartop said, like bees and butterflies.

“So much attention is dedicated to charismatic groups like pollinators and pretty things,” she said. “Flies take a bit more time to get to know and love.”

That’s one reason why fly science still has enormous gaps. In the genus Hartop studies within the family Phoridae, known as Megaselia, it’s unclear, for example, if there are 20,000 species, 100,000, or closer to 1 million. In other words, large sections of the fly family tree have yet to be filled in.

This is a problem, Hartop said.

Because flies occupy so many different habitats and roles within those habitats, the status of their populations is a useful indicator of how the environment is doing — i.e., whether it’s healthy or not. Even baseline numbers are missing. That makes it challenging to understand how ecosystems and the services they provide are changing due to threats like climate change.

“I’ve been to so many talks on things like bees and butterflies where they’re described as a proxy for how an environment is doing as a whole,” Hartop said. “I think that’s a really broken way to look at things.” Studying bees is useful for understanding how pollinators are doing, she said, but not the broader environment.

Scientists like Hartop are helping fill these gaps, such as by surveying different landscapes and streamlining the time-intensive process of sequencing fly DNA to describe new species. She has come across hundreds of new species, about 60 of which she’s formally described.

 Emily Hartop and Brian Brown/Biodiversity Data Journal (Image by Kelsey Bailey)
A fly in the genus Megaselia that Emily Hartop discovered. She named it Megaselia shadeae, after her niece Shade.

That’s what’s so exciting about studying flies, she said: There’s so much opportunity for discovery. You don’t have to travel to the deep sea to find a new species; there could be undiscovered species of flies in your backyard, perhaps even in a place like New York City, Hartop said. Each discovery is a chance to understand an influential member of the ecosystem.

“We really need to shift our thinking and we need to look at some of these groups that we’re not paying attention to,” Hartop said. “I don’t expect people to relate to very small flies in the way that they relate to a butterfly. But understanding the role that they play, understanding their importance, I think that is critical.”

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