Upon skinning and butchering of one of the animals, numerous larvae (presumably H. tarandi, although not explicitly stated) are apparent on the inside of the caribou pelt. The eggs of a botfly hatch in the uterus of the female fly and while in flight she ejects minute larvae into the nostrils of the host deer. MenuHomeAbout Us CloseStaff & Board MembersNewsletters & Annual ReportsContact UsPrograms & Projects ClosePrograms & ProjectsMentoring ProgramNatural NeighborsNorthern Long-eared BatsSpotted Turtle Research and TrackingBeach-Nesting Bird ProtectionPrograms & ProjectsBlack Racer Snake StudySnake Mapping & MonitoringTracking Willet MigrationCoastal Otter Research2013 Belted Kingfisher & Swallow Colony SurveysMarthas Vineyard Atlas of LifeBirding MV CloseMarthas Vineyard Bird ClubMV Christmas Bird CountNewsWork With Us CloseEmployment OpportunitiesMentoring ProgramVolunteer Opportunities, Spring-SummerSupport Us CloseDonate NOW!Center for Wildlife Studies Capital CampaignEven More Ways to Donate Close Search for: Flies the order Diptera are an incredibly diverse group, and theyve evolved an astonishing array of bizarre life histories. In scientific journals as well as the lay press, the botfly has been widely publicized as the fastest thing on earth. The earliest known cases of deer botflys was documented by the Greek philosopher Aristotle in 384 BC when he noted the prevalence of nasal botflies in red stags, so this is something that deer have been dealing with for many generations. What is the worst thing about being a white-tailed deer? Their larvae live inside living mammals. Theres an amazing array of insects, worldwide, that strongly resemble stinging bees and wasps. This adult deer bot fly, Cephenemyia phobifer, was resting on a support beam at the top of a fire tower in Osage County. Bot fly larvae often secret antibiotic chemicals as they feed, reducing the chance of infection (which is self-serving for the parasite, as an infection could cause its own death). Click it to build a custom PDF with species shown on that page or for all the species within that taxonomic level. The larval stages of Cephenemyia are obligate parasites of cervids. Please try the buttons above to search for information from other sources. Odor may be a cue to help the female flies locate such spots. In most cases, botflies do not kill their host. On the Cephenemyia flight mechanism and the daylight-day circuit of the Earth by flight. Corrections? In large numbers, and varying with the species, the parasitic larvae can injure livestock, interfere with proper nutrition, or impede breathing. [8] Removal of the eggs (which adhere to the host's hair) is difficult, since the bone and tendons are directly under the skin on the cannon bones; eggs must be removed with a sharp knife (often a razor blade) or rough sandpaper and caught before they reach the ground. The larva should be removed as soon as possible, to avoid worsening of theinfection. As soon as the first symptoms appear, it is important to consult with a dermatologist, an infectious disease specialist or aG.P. fox hill country club membership cost. Outdoor Life. Image credit: Karsten Heinrich/Wikimedia.org. Deer nose botflies have been reported from nearly all areas of the continental U.S. and Canada. To maintain a velocity of 800 miles per hour, the 0.3-gram fly would have had to consume more than 150% of its body weight in food every second; The supersonic fly would have been invisible to the naked eye; and, This page was last edited on 3 January 2023, at 21:35. 2013 Belted Kingfisher & Swallow Colony Surveys, Center for Wildlife Studies Capital Campaign. The good news botflies do not affect a deers overall health or the venison. Because the bot larva secretes antibiotic chemicals, the wound it causes rarely becomes seriously infected, and people usually fare surprisingly well if they dont kill the insect. Its also available now on AT&T U-Verse, Channel 1644, among other networks. America Thomas Say Foundation Monograph, College Park, MD. It has brightly colored compound eyes and large clear wings to match. Wearing a hat and clothing with long sleeves and pants helps to minimize exposed skin. the North American and European deer nose bot flies (Cephenemyia) and the sheep bot fly (Oestrus ovis). Then there are the many groups of true bees that these flies mimic: bumble bees, apid bees, andrenid bees, megachilid bees, longhorn bees, and more. Infestation is characterized by an irritated bump with a hole in the center for the larval breathing tube. Those that live just under the skin often form a bulge. The hole is enlarged and the carcass is removed with forceps or tweezers. Exciting news continues to roll in for deer hunters and opportunities to watch great shows! I managed just a couple of photos before it darted off again. In late May, I was looking for insects in Correllus State Forest when a good-sized fly, resembling a bumblebee, caught my eye as it flew in and perched on a stick on the ground . Time magazine published an article in 1938 debunking Townsend's calculations.[9]. She then makes the slipattaching 15 to 30 eggs onto the insect or arachnid's abdomen, where they incubate. [3], Aristotle (384 BC 322 BC) described deer botfly larvae[3] as follows:[4]. Closing allwindows and doors after it getsdark; Avoid having food or liquids accumulating indoors. Occasionally, horse owners report seeing botfly larvae in horse manure. Deer bot flies, or deer nose botflies ( Cephenemyia spp. Larvae (probably this species) have been found parasitizing dogs and humans in New Hampshire. Nasal bots are botfly larvae in the genus Cephenemyia that develop in the nasal passages of deer and many other North American cervids as part of the bot's natural lifecycle. When it finds a suitable host (limited to white-tailed deer for this fly species on Marthas Vineyard), an adult female Cephenemyia expels a larva into a nostril of the deer. Other species of botfly are found across the globe, primarily but not exclusively in warm tropical and subtropical regions. Find the perfect deer bot fly stock photo, image, vector, illustration or 360 image. Well, its almost something out of a sci-fi movie. In other species, the unhatched eggs are distributed in like manner. Browse 77 bot fly stock photos and images available, or search for dog fly or lion to find more great stock photos and pictures. ACCUEIL; nutricia flocare infinity troubleshooting; The adult lacks biting mouthparts and does not feed. botfly Any of several families of stout, hairy, black-and-white to grey fly. Botflies are found globally and parasitize many species of animals such as mice, squirrels, and rabbits. Bot Flies [fact sheet] Bot flies comprise the family Cuterebridae, and are parasites that attack mammals. Diet: Larvae require mammalian flesh. 35: 245-252. Adults do not have functional mouthparts and do not eat. Bot flies are chunky, beelike flies usually with rounded heads. They can cause some symptoms such as: The diagnosis of botflyin humans is usually made by adermatologist or aninfectologist through the observation ofthe woundon the skin. Those that live just under the skin often form a bulge (called a warble); typically, theres a small hole in the center of the welt through which the larvas breathing tubes extrude. The larvae can spend between four and 18 weeks burrowed into the host before falling off to pupate in the soil. Many animals parasitized by bot flies show no external sign of infection. Adults are not commonly seen. Socit de mdias/d'actualits valorisant le peuple et la culture GBAN. Of families of flies causing myiasis, the Oestridae include the highest proportion of species whose larvae live as obligate parasites within the bodies of mammals. They are found mainly in the tropics, with a few species in temperate regions. Copyright 2023, University of New Hampshire. Bot flies, found in Central and South America, produce larvae containing internal parasites of mammals and lay them on human skin. You have likely seen deer reacting to nasal bots in summer. Cephenemyia sp. We humans are horrified by parasites, but as a way of life, parasitism is much less violent than outright predation. In this final blog of the Year of the Fly, Tony Irwin considers a double helping, with two "flies of the month" to celebrate the Christmas season. It is one of relatively few flies that give birth to live young instead of laying eggs (technically, eggs are produced but hatch within the adult females reproductive tract). North American Species of Cuterebra, the rabbit and rodent bot flies (Diptera: Cuterebridae). [3] Larvae migrate to the base of the animal's tongue, where they mature in clusters to a size of 25 to 36mm. As the larva grows, a boil-like swelling (called a warble) develops in the host. Comments on: Deer Bot Fly [3], In Scandinavia, the only species present are C. trompe, C. ulrichii, and C. stimulator. Arthropodsinvertebrates with jointed legs are a group of invertebrates that includes crayfish, shrimp, millipedes, centipedes, mites, spiders, and insects. Eventually fully developed larvae will exit the deer (possibly through a sneeze) and pupate in the ground to . In 1938 Irving Langmuir, recipient of the 1932 Nobel Prize in Chemistry, examined the claim in detail and refuted the estimate. They reported a deer botfly with a speed of over 800 miles per hour. Insect bites or staphylococcal because of the mentioned bare very similar traits. At first glance, what a hunter encounters looks like a large maggot. Ninety-nine mule deer (Odocoileus hemionus) from four Utah counties (Cache, Utah, Sanpete and Sevier) were examined for larvae of Cephenemyia spp. Their larvae are internal parasites of mammals, some species growing in the host's flesh and others within the gut. http://www.deeranddeerhunting.com/ Learn more about nasal bots and how they affect deer year-round. We have three species of them in New Hampshire. Adult bot flies generally lack functional mouthparts and are unable to feed; because of their resulting short adult life spans and the hidden lives of their larvae, bot flies are not frequently encountered. Adults have reduced or absent mouthparts and generally do not eat at all. [12] A method using a reverse syringe design snake bite extractor prooved to be suitable for removing larvae from the skin. If you've even seen a deer coughing and sneezing it could well be in response to the wiggling movement of grubs through the nose and throat. Outdoor Life - Katie Hill. To create your own list of species, use the PDF Creator tool at the bottom of the Advanced Search page. Nasal Bots in Deer. Like many species of botfly, Dermatobia grows within the skin. Consult your veterinarian for advice on how to handle infestations. The human botfly is 12 to 19 mm in length, with hair and spines on its body. ThoughtCo, Feb. 17, 2021, thoughtco.com/botfly-facts-4173752. In the Durham area, most of the adults are found from June through September. Long ago, a claim was made that bot flies could fly 800 miles per hour, but that is clearly incorrect. After the eggs are laid by the female botfly, the larvae hatch after about six days, and rapidly penetrate the skin, even when the skin is intact and healthy. Other tips for recognizing them as true flies (and not the bees they mimic) include tiny antennae, large eyes, and a pair of knobby structures (halteres) where the second pair of wings would be. When their feeding is complete and theyre ready to pupate, they usually leave the host and pupate in the soil. The human botfly (Dermatobia hominis) is a tropical species that occurs from southern Mexico south into most of South America. But theres one scourge that has got to really bother the whitetail: botfly larvae. https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=IIDIPY8020, Bumble Bee Species Accounts at Montana Entomology Collection, Field Guide to Common Western Grasshoppers, Native Wildflowers and Bees of Western Montana, Natural Heritage MapViewer (Statewide Database of Animal Observations), North American Dragonflies - Slater Museum of Natural History, USDA Grasshoppers: their biology, identification, and management, Xerces Society for Invertebrate Conservation, Web Search Engines for Articles on "Deer Bot Fly", Additional Sources of Information Related to "Insects". Nose botflies (Cephenemyia spp. It has also been reared from house mouse, Norway rat and roof rat. The larvae remain attached and develop for 1012 months before they are passed out in the feces. Check your local listings for Pursuit Channel. A Deer bot fly flies at 90 miles per hour. Thompson F.C., Pape T., Evenhuis N.L. There is a species of bot fly that routinely parasitizes humans, but relax; it is not found in Missouri. 2007 - 2023 Tua Sade All rights reserved. When a horse rubs its nose on its legs, the eggs are transferred to the mouth and from there to the intestines, where the larvae grow and attach themselves to the stomach lining or the small intestine. There is no known risk to humans. 1981. The hawkmoth flies at 11 kph faster than a deer bot fly. Watch this deer sneeze because of a botfly larvae problem, caught on a StealthCam camera: What are botfly larvae, and how do they infect a deer? These larvae quickly migrate through the nasal passages into the nasopharyngeal (throat) region, preferably in the throat (retropharyngeal) pouches (causing nasopharyngeal myiasis in the host), where they settle and develop. Females flick newly hatched larvae into the nostrils of deer or elk. Often, they are attracted to open wounds or moist, protected parts of the body dirty with urine or fecal material (such as the rear ends of sheep or other livestock). Aristotle almost certainly described larvae of Cephenemyia, commonly known as deer nose bots, when he wrote, "Without any exception stags are found to have maggots living inside the head, and the habitat of these creatures is the hollow underneath the root of the tongue, and in the neighborhood of the vertebrae to which the head is attached. Hawk moths (or sphinx moths) can fly about 33 miles per hour, and a horse fly was recorded flying nearly 90 miles per hour. These species infest pets, livestock, and wild animals. 63% of the southeastern NH specimens in the UNH insect collection were found during August, as was the adult in my photograph. About one week after laying, the eggs are ready to hatch, but they must wait for a sudden increase in temperature to trigger that hatching. Some forms of botfly also occur in the digestive tract after ingestion by licking. Meanwhile, in cases where harmless species have adapted to copy the look of harmful species, basically fooling potential enemies into leaving them alone, its termed Batesian mimicryagain, after the biologist who proposed the idea. Nasal botfly larvae are the stuff of nightmares. The just-hatched larva of C. fontinella enters white-footed mouse through mucous-lined openings like mouth, eye, nose or anus. Formation of wounds on the skin, with redness and slight swelling on the region; Release of a yellowish or bloody fluid from the sores on the skin; Sensation of something stirring under the skin; Pain or intense itching at the wound site. Botflies, also known as warble flies, heel flies, and gadflies, are a family of flies known as the Oestridae. What are synonyms for Bot-fly? Myiasis can be caused by larvae burrowing into the skin (or tissue lining) of the host animal. References: Biology and range are reported in: Sabrosky, C.W. There they become attached in clusters and develop into what can best be described as full-sized maggots. Largely according to species, they also are known variously as warble flies, heel flies, and gadflies. The human botfly, Dermatobia, has yellow and black bands, but other species have different coloration. Fun Fact: Botfly larvae are edible and are said to taste like milk. 1986. It is probably a male, since males are known to congregate at high places in the landscape to look for females. Cuterebra ruficrus is in southern NH, and attacks rabbits and hares. The Deer Fly is a large insect that comes in 250 varieties. It was once famously claimed by Char. Check Elk/Bear Permit Application Results, Managing Invasive Species in Your Community, Wildflowers, Grasses and Other Nonwoody Plants. Because of the very rare occurrence of botfly infections, these are usually misdiagnosed as leishmaniasis, cellulitis or furunculosis. However, sometimes the irritation caused by the larvae leads to skin ulceration, which can result in infection and death. The behavior is typical running around wildly, swatting their noses, sneezing and even submerging their snouts in water and blowing profusely. These wings will come with dark bands. She has taught science courses at the high school, college, and graduate levels. Updates? View taxon at NatureServe. Some of the best ways to avoid gettingabotfly infection, especially when traveling to a tropical country, include: In addition, in tropical regions it is recommended to iron all clothing before dressing, especially if it has been sun drying, since the eggs of the fly may stick to the fabric. Usually eggs are laid on the host and the larvae cause damage to the host's skin or internal systems. I hope youll join me in exploring the natural diversity of this incomparable place! They attack chiefly the nostrils and pharyngeal cavity of members of the deer family. Larvae from these eggs, stimulated by the warmth and proximity of a large mammal host, drop onto its skin and burrow underneath. Hi Susy, We are quite excited to get your image of Nasal Bot Fly Maggots in a Deer's head. Finding this one was certainly a first for me. Contributors own the copyright to and are solely responsible for contributed content.Click the contributor's name for licensing and usage information. 2002. If you think you are your livestock or pets are parasitized by bot flies, seek medical attention. login or register to post comments. Applying adhesive tape to the breathing hole, which sticks to the mouthparts and pulls out the larvae when the tape is removed. https://www.thoughtco.com/botfly-facts-4173752 (accessed March 4, 2023). Get tips from Steve Bartylla in this Hunt em Big. I asked several hunters I know if theyve ever observed one of these larvae, perhaps emerging from a downed deer, and only one reported having seen one. You can significantly reduce the chances of being attacked, by sunbathing on a blanket, rather than directly on the grass. Usually the larvae do not cause considerable harm to the host other than mild irritation, but heavy infestation may be fatal to the host (death by suffocation) and consequently to the parasite. In the scientific world this fly belongs in the genus Cephenemyia. They are large, gray-brown flies, often very accurate mimics of bumblebees. They do not kill the host animal, thus they are true parasites. How to Kill Mosquitoes: What Works and What Doesn't, Phylogeny of Oestridae (Insecta: Diptera), Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College, Also Known As: Warble flies, gadflies, heel flies. Post graduate in Clinical Dermatology, Cosmiatric and Surgery by CMMG in 2012 and member no. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Different types of bot flies focus on certain types of mammals, and different species grow in different parts of their hosts body: some growing under the skin, some in the gut, some in nasal or throat passages, and so on. After mating, the female botfly captures the phoretic insect by holding onto its wings with her legs. There are over 30 species of blood feeding deer flies ( Chrysops) and horse flies ( Tabanus, Hybomitra) found in Wisconsin. The botfly is any fly from the family Oestridae. Dan Schmidt and Jon Heaton examine bot fly larvae in this. Nasal Bots in Deer: Harmless but Irritating. Migratory Kinetics of Cuterebra fontinella (Diptera:Cuterebridae) in the White-Footed Mouse, Peromyscus leucopus. They attack chiefly the nostrils and pharyngeal cavity of members of the deer family. The details vary from bot fly to bot fly, with different taxonomic groups of bot flies targeting different mammalian species and different parts of the body. What you are likely observing are bot fly larvae (genus Cephenemyia). In the meantime . A smallish family with about 40 North American representatives, the bot flies (family Oestridae) all have larvae that mature as endoparasites on mammals that is, the fly larvae matures inside a mammals body. Deer & Deer Hunting is inviting you to our new Saturday Night Deer Camp only on Pursuit Channel. There may be as many as 10 million species of insects alive on earth today, and they probably constitute more than 90 percent all animal species. Eggs hatch inside the female fly and the newly emerged larvae are deposited in the nostrils of a suitable host. Good thing they're quite common and practically harmless in big game . The botfly that attacks deer is possibly the world's swiftest insect, flying at 80km/h . They attack chiefly the nostrils and pharyngeal cavity of members of the deer family. Omissions? Compared to native host species (like white-footed mouse), non-native hosts (Norway rat, black rat, house mouse, etc.) These larvae are very common in white-tailed deer. They belong to a family of flies called the Tabanids. Bot flies comprise the family Cuterebridae, and are parasites that attack mammals. Fawns and adult deer greater than or . When the larvae find themselves within a suitable host, they make their way to the targeted tissues and burrow in. However, without any exception, stags are found to have maggots living inside the head, and the habitat of these creatures is in the hollow underneath the root of the tongue and in the neighbourhood of the vertebra to which the head is attached. After the eggs are laid by the female botfly, the larvae hatch after about six days, and rapidly penetrate the skin, even when the skin is intact and healthy. Records: There are 3 records in the project database. Here's some links if you want to download a whole group. Understandably, many people opt for medical removal of the bot. (pgs 335-6) ISBN 0-12-510451-0. [1] The genus name comes from the Greek kphn, drone . White-footed mouse is the most common host for C. fontinella. Also, large numbers of adult bot flies can distress livestock with their incessant attacks around the nose and mouth. These eggs, which look like small, yellow drops of paint, must be carefully removed during the laying season (late summer and early fall) to prevent infestation in the horse. It has been credited with speeds over . About 40 species in North America north of Mexico, Oestridae (bot flies) in the order Diptera (flies). [2], It was reported for many years that Cephenemyia was the fastest of all flying insects, cited by The New York Times[5] and Guinness Book of World Records as traveling at speeds of over 800 miles per hour (ca. Distinguishing Features: Hairy fly with a metallic "bot" appearance. Let us know if you have suggestions to improve this article (requires login). deer bot fly The larvae of some species grow in the flesh of their hosts, while others grow within the hosts' alimentary tracts. For example, equine botflies lay eggs that resemble tiny drops of yellow paint on the horse's coat. While in-flight the female ejects tiny larvae into the nostrils of the host deer. Plane Designers See 800-Mile-an-Hour Fly; Cephenemyia, Fastest Living Creature, Is Shown at the University of Rochester Museum. University of New Hampshire Extension(877) 398-4769 Largely according to species, they also are known variously as warble flies, heel flies, and gadflies. We protect and manage the fish, forest, and wildlife of the state. Check the confirmation mail we've sent you. The only species of botfly that parasitizes humans is . Bot flies can parasitize several species of livestock. This bug is reputed to have at-tained the surprising speed of 818 miles per hour (sound travels 740 miles per hour). Dragonflies can fly about 25 miles per hour. The deer nose bot fly Cephenemyia phobifer, photographed in Correllus State Forest on May 22, 2022. [17], The Babylonian Talmud Hullin 67b discusses whether the warble fly is kosher.[18]. botfly. The botfly is a type of parasitic fly, best known for disturbing images of its larval stage buried in skin and from horror stories of infested people. Retrieved from https://www.thoughtco.com/botfly-facts-4173752. A fascinating account of the speed of a Deer Bot fly, Cephanomvia pratti, was made by entomologist C. H. T. Townsend in 1926 by estimating the speed of the fly as it flew between mountaintops. The head end is narrow, while the rear end is broad and blunt. USNH Privacy Policies USNH Terms of Use ADA Acknowledgment Affirmative Action Jeanne Clery Act. [13], Dermatobia hominis, the human botfly, occasionally uses humans to host its larvae. Bee-Like Robber Fly. We have three species of them in New Hampshire. Botfly is an infectious type of disease that is caused by the Dermatobium hominis species of fly, which is gray with black stripes on the thorax and a metallic blue abdomen. Our most common bot fly is Cuterebra fontinella, reported to occur in most of the continental US (except Alaska), plus southern Canada and Northeastern . 39 kilometre (s) per hour. Their life cycles vary greatly according to species, but the larvae of all species are internal parasites of mammals. Our editors will review what youve submitted and determine whether to revise the article. She then flies close to the head of her host species and while hovering ejects her larvae into its nostrils. Available for both RF and RM licensing. Mature larvae drop from the host and complete the pupal stage in soil. View in other NatureServe Network Field Guides. Abstract. The flies are obligate internal mammalian parasites, which means they can't complete their life cycle unless the larvae have a suitable host. Other botfly species are found worldwide. Would you like to receive email notifications when we publish a new post? The two other species of bot flies in New Hampshire are both uncommon. Saturday Night Deer Camp: Its all about the people, the places and the camaraderie that make hunting a lifestyle. Well, to me, it would have to include the infestation of external parasites, including ticks, screw-worms, mosquitoes and black flies. Their larvae live inside living mammals. Habitat: The human botfly lives primarily in Central and South America. "The moose throat bot fly Cephenemyia ulrichii larvae (Diptera: Oestridae) found developing in roe deer (Capreolus capreolus) for the first time". The botfly is a type of parasitic fly, best known for disturbing images of its larval stage buried in skin and from horror stories of infested people. () Acceptable modern experiments have established that the highest maintainable airspeed of any insect, including the deer bot-fly (Cephenemyia pratti), hawk moths (Sphingidae), horseflies (Tabanus bovinus) and some tropical butterflies (Hesperiidae), is 39 km/h (24 mph), rising to a maximum of 58 km/h . Townsend, C. 1927. These larvae quickly migrate through the nasal passages into the nasopharyngeal (throat) region, preferably in the throat (retropharyngeal) pouches (causing nasopharyngeal myiasis in the host), where they settle and develop. All rights reserved. She might lay eggs directly on the host, but some animals are wary of botflies, so the flies have evolved to use intermediate vectors, including mosquitoes, houseflies, and ticks. Where the same warning signals (such as coloration or loud buzzing) is shared honestly among stinging insects, its termed Mllerian mimicry. Roughly 150 species are known worldwide. teeth whitening light does it work. Varies by species. Stagworm - Definitions from Dictionary.com. Hosted by Dan Schmidt, Gordy Krahn, Mark Kayser and Steve Bartylla, the show enters its 14th season and covers everything related to deer hunting, from tactics and strategy to gear, biology, great hunts and more. Those White Grubs in Your Deer's Nose Are Just Botfly Larvae. In late August, I have found white footed mice with live larvae, and a colleague gave me a photo of a Peromyscus sp. If you have a high quality photo of this species, are confident in the identification, and would like to submit it for inclusion on the Montana Field Guide, please send it to us using our online photo submission tool. With its hairy, striped body, you could say a botfly looks like a cross between a bumblebee and a house fly. Killing the larvae before removal, squeezing them out, or pulling them out with tape is not recommended because rupturing the larvae body can cause anaphylactic shock, make removal of the entire body more difficult, and increase the chance of infection. pratti. Our programs and projects are funded through grants and donations.Thank you for helping us to protect wildlife and biodiversity for future generations. Their habits may be appalling to human sensibilities, but you have to admit that these flies amply illustrate the infinite creativity of evolution. Adult flies mate and then the female deposits up to 300 eggs. Don't Panic. (Killing the larva while its in ones flesh typically causes an infection.) If you need expert professional advice, contact your local extension office. Horse bot flies, for example, tend to congregate around horse stables and pastures, especially in midsummer and fall.