Discover 7 Natural Predators That Eat Flies

deer fly
© Paul Reeves Photography/

Written by Lev Baker

Updated: July 13, 2023

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Flies are an integral part of various ecosystems, but many different natural predators help keep their populations in check. These predators help maintain a balanced ecosystem and contribute to controlling the spread of diseases associated with flies. In this article, we will explore some of the common animals that are natural predators of flies, delving into their unique features, hunting techniques, and their vital roles in their respective habitats.

Chameleons are distinguished by their exceptional features, such as a flattened body, a tail, and zygodactylous feet, with two toes pointing forward and two backward.

Frogs (Anura)

California red-legged frog

Predominantly carnivorous, frogs chiefly consume insects and small



©Jason Mintzer/

Captivating members of the Anura order, frogs are a multifaceted class of amphibians that flourish in a plethora of environments worldwide, encompassing equatorial rainforests, temperate woodlands, savannas, marshlands, and even arid deserts. Boasting a staggering 5,000 species, frogs manifest a remarkable spectrum of dimensions, hues, and configurations. 

Some of the most prominent families include Ranidae (true frogs), Hylidae (tree frogs), and Bufonidae (toads). Displaying a variety of colors and patterns, frogs utilize their appearance for camouflage or to convey warning signals to potential predators.

Most species have either smooth or slightly warty skin, contingent upon their classification. Frogs are characterized by a distinct head with large, protruding eyes, offering exceptional vision, particularly in low-light situations. Their compact, sturdy bodies are equipped with elongated, powerful hind legs, adapted for leaping and swimming, while their shorter forelimbs are primarily used for movement and capturing prey. Moreover, most frogs have webbed feet, augmenting their swimming proficiency.


Predominantly carnivorous, frogs chiefly consume insects and small invertebrates. Flies form a substantial portion of their diet, establishing frogs as natural predators of these insects. While flies are pervasive sustenance for frogs, these amphibians are also indiscriminate consumers, devouring a wide variety of accessible food, including mosquitoes, arachnids, coleopterans, and annelids. Some larger frog species may even consume small fish, crustaceans, or other frogs. Frogs use their elongated, adhesive tongues to catch unsuspecting insects swiftly.


Frogs reside in an array of ecological systems, spanning woodlands, savannas, marshlands, swamplands, lentic environments, and anthropogenic surroundings such as horticultural landscapes and cultivated terrains. They heavily rely on water for reproduction, as their eggs and larvae require an aquatic environment. Certain frog species are arboreal and predominantly occupy arboreal spaces, while others favor terrestrial or aquatic proximities, contingent on their particular adaptational traits.

Environmental Impact

In biotic communities, frogs fulfill a pivotal function as both predators and prey. They aid in controlling insect populations and act as a food source for larger animals, such as birds, snakes, and mammals. Furthermore, frogs are considered bioindicators, with their presence or absence in an ecosystem reflecting their overall health.

Presently, global frog populations exhibit a diminishing trend as a consequence of habitat attrition, contamination, climatic fluctuations, and the proliferation of communicable maladies like chytridiomycosis, a mycotic ailment predominantly afflicting amphibians.

In better news, conservation efforts are underway to protect these remarkable creatures and their habitats, ensuring their survival for future generations.

Bluebirds (Sialia)

pair of eastern bluebird

Predominantly insectivorous, bluebirds consume insects and diminutive invertebrates.


Bluebirds are petite to moderately-sized songbirds celebrated for their stunning appearance and melodic songs. A trio of bluebird species are recognized inhabitants of the North American continent, specifically the eastern bluebird (Sialia sialis), the western bluebird (Sialia mexicana), and the mountain bluebird (Sialia currucoides).

Distinguished by their vivid plumage, male bluebirds generally exhibit more vibrant colors than their female counterparts. Eastern and western bluebirds showcase a dazzling blue upper body paired with a reddish-orange breast, while the mountain bluebird is primarily sky-blue. Female bluebirds of all species present more subdued hues, featuring grayish-blue tones and a light orange chest. Bluebirds possess sleek, slender bodies, short and straight beaks, and comparatively short tails.


Predominantly insectivorous, bluebirds consume insects and diminutive invertebrates, with flies constituting a considerable segment of their alimentation.

As natural predators of flies, bluebirds contribute to regulating insect populations within their habitats. Depending on availability, they may also eat spiders, beetles, caterpillars, and grasshoppers. Although insects constitute most of their diet, bluebirds also consume fruits and berries, particularly during the winter months when insects are scarce.

Bluebirds can easily spot and catch insects inhabiting open environments such as meadows, pastures, open woodlands, and forest edges. They are frequently found in orchards, parks, and gardens as well. As cavity nesters, bluebirds depend on natural tree cavities, fence posts, or human-provided nest boxes for nesting. The accessibility of nesting sites is vital for maintaining their population and successful breeding.


During the breeding season, territorial bluebirds defend their nesting areas. They usually produce one or two broods annually, with females constructing the nest and incubating the eggs while males feed the hatchlings. Bluebirds are also known for their sociable nature, often forming small flocks outside the breeding season.

Environmental Impact

Bluebird populations have encountered difficulties due to habitat loss, competition for nesting sites with invasive species like European starlings and house sparrows, and pesticide exposure. However, conservation initiatives, such as creating bluebird trails (sequences of nest boxes placed in appropriate habitats) and promoting eco-friendly gardening practices, have contributed to stabilizing and increasing bluebird populations in recent years.

Common House Spider (Parasteatoda tepidariorum)

Common House Spider in a Bathroom

Common house spiders are known to be primarily insectivorous, consuming insects, including flies, mosquitoes, ants, and other small invertebrates.

©Sample Stars/

The common house spider is an essential natural predator of flies, effectively managing their populations. These spiders frequently inhabit human dwellings, earning their name due to their pervasive presence in residential settings.

Common house spiders exhibit a range of colors, from light brown to dark grey, and are easily identified by the noticeable chevron-like markings on their abdomen. These markings often have lighter and darker shades that complement their base color. House spiders possess eight legs and two body segments: the cephalothorax (front) and the abdomen (rear). Generally, common house spiders are less than a quarter of an inch (or 6 mm) long, with female specimens larger compared to males. Another characteristic feature of these spiders is their eight eyes, arranged in two horizontal rows.


Common house spiders are known to be primarily insectivorous, consuming insects, including flies, mosquitoes, ants, and other small invertebrates. As opportunistic predators, they capture insects ensnared in their webs. Flies, frequently found in human residences, represent a significant portion of their diet, as they are easily trapped in the spiders’ webs.


As their name suggests, common house spiders are often encountered in residential areas, occupying corners, window frames, basements, garages, and sheds. They prefer locations where they can build irregular, tangled webs to capture prey. These webs are typically situated in areas with high insect traffic, like near windows or lights. Common house spiders are highly adaptable and thrive in various indoor and outdoor environments.

Environmental Impact

By preying on flies and insects, common house spiders are a natural form of pest control, helping maintain a balanced ecosystem within and around human dwellings. 

Chameleons (Chamaeleonidae)

What Do Veiled Chameleons Eat - Chameleon on Branch

Primarily insectivorous, chameleons’ diet consists mainly of flies, insects, and small invertebrates like grasshoppers, crickets, and spiders.

©Lauren Suryanata/

Chameleons are remarkable reptiles known for their unique appearance and extraordinary adaptations, making them natural predators of flies. They play an essential role in regulating insect populations within their habitats.

These captivating creatures are distinguished by their exceptional features, such as a flattened body, a tail, and zygodactylous feet, with two toes pointing forward and two backward. This configuration enables chameleons to grasp branches securely. Renowned for their color-changing ability, chameleons possess specialized cells called chromatophores in their skin. Mood, temperature, and environmental conditions can trigger these color transformations. Additionally, chameleons have independently movable, protruding eyes, providing an almost 360-degree field of vision crucial for detecting prey and predators. Finally, their long, extendable tongues can be rapidly projected to catch insects from a considerable distance.


Primarily insectivorous, chameleons’ diet consists mainly of flies, insects, and small invertebrates like grasshoppers, crickets, and spiders. Some larger chameleon species may occasionally feed on small vertebrates such as lizards or birds. Chameleons rely on their exceptional eyesight and swift tongues to capture prey.


Chameleons flourish in an array of habitats, encompassing tropical rainforests, grassy savannas, verdant meadows, and elevated terrains. Their natural habitats span Africa, Madagascar, and parts of southern Europe, the Middle East, and southern Asia. As arboreal animals, chameleons spend most of their time in trees and bushes, where they can easily spot and catch insects while remaining camouflaged.

Environmental Impact

Chameleons contribute to the balance of their ecosystems by preying on flies and other insects. Their distinctive features and adaptations make them highly skilled hunters, effectively managing insect populations.

Day Geckos (Phelsuma)

They primarily consume insects, with flies constituting a significant portion of their diet.


Day geckos, renowned for their striking colors and daytime activity, are efficient predators of flies, aiding in the regulation of insect populations in their habitats. These fascinating lizards belong to the Phelsuma genus, encompassing over 70 unique species.

Characterized by their slender bodies, vibrant hues, and large, round eyes, day geckos display a spectrum of bright green, blue, yellow, and red colors, often adorned with intricate patterns or markings. In addition, their specialized adhesive toe pads, called lamellae, enable them to scale even the smoothest surfaces effortlessly. Depending on the species, these small to medium-sized lizards typically measure between 3 and 12 inches in length.


Day geckos primarily consume insects, with flies constituting a significant portion of their diet. Their diverse prey selection includes insects like crickets, moths, and spiders. In addition to insects, these geckos feed on nectar and fruit, making them omnivores. They rely on their agility and keen eyesight to capture prey.


This squamate, or scaled, reptile occupies tropical and subtropical biomes, such as dense rainforests, coastal woodlands, and estuarine mangrove ecosystems. They are predominantly found in Madagascar, the Comoros Islands, and Seychelles, with some species also present in East Africa and the Mascarene Islands. Day geckos are arboreal creatures, typically residing in trees or bushes where they can easily spot and catch insects while remaining camouflaged. They prefer areas with high humidity and abundant vegetation.


As diurnal animals, day geckos are active during daylight hours, unlike many nocturnal gecko species. Their vivid colors and large, round eyes are adaptations that facilitate their daytime activities. Moreover, day geckos are known for their territorial behavior, with males often engaging in aggressive displays to defend their territories.

Day geckos play a crucial role in maintaining a balanced ecosystem in their habitats by preying on flies and other insects. Their eye-catching appearance, diurnal habits, and varied diet make these reptiles both intriguing and valuable components of their ecosystems.

Tyrant Flycatchers (Tyrannidae)

Hammond’s Flycatcher

The primary diet of flycatchers consists of insects, with flies forming a significant portion of their prey.

©Feng Yu/

Tyrant flycatchers are natural predators of flies, as evidenced by their name, effectively controlling insect populations in their habitats. These flycatchers are characterized by their generally small to medium-sized bodies, which range from about 3.5 to 16 inches, depending on the species. Their coloration is typically subdued, with shades of gray, brown, olive, and yellow. Many species have distinguishing markings, such as wing bars or distinctive head patterns. These birds have a relatively flat, broad bill, often with a hooked tip, which is well-adapted for capturing insects.


The primary diet of tyrant flycatchers consists of insects, with flies forming a significant portion of their prey. In addition, they ingest various insects and minute invertebrates, including coleopterans (beetles), lepidopterans (moths), and orthopterans (grasshoppers).

Some species supplement their diet with fruits and berries, especially during seasons when insects are less abundant. Tyrant flycatchers are known for their acrobatic hunting style, often catching insects in mid-air or hovering briefly to snatch them from vegetation.


Tyrant flycatchers inhabit many environments, including forests, grasslands, wetlands, deserts, and suburban and urban areas. Their habitat preferences vary depending on the species. They are generally in areas with an abundance of insects and suitable perching spots for hunting. Some species, such as the eastern phoebe, are also known for their adaptability to human-made structures, often building their nests on buildings or bridges.

Environmental Impact

These birds play a vital role in their ecosystems by preying on flies and other insects, maintaining a balanced environment, and helping to control pests. Many tyrant flycatchers are also known for their vocalizations, ranging from melodious songs to harsh calls, depending on the species.

While most tyrant flycatcher species are not currently threatened, some face challenges due to habitat loss, pesticide exposure, and climate change. Conservation efforts, such as habitat restoration and the reduction of pesticide use, are essential for ensuring the survival of these beneficial birds and the ecosystems they inhabit.

Jumping Spiders (Salticidae)

Phidippus regius, regal jumping spider - Black Spiders in Florida

As voracious hunters, jumping spiders employ a unique hunting technique that involves stalking, pouncing, and utilizing their silk thread as a safety line.


Jumping spiders are a fascinating group of arachnids that are natural predators of flies and various other insects. Their unique appearance and behavior contribute to their impressive hunting prowess.

When it comes to appearance, jumping spiders showcase a diverse range of colors and patterns. Typically, these agile critters possess a compact, stout body with a hairy texture. Their most distinctive feature, however, is their exceptional eyesight, attributed to their four pairs of eyes. The large, anterior median eyes grant them excellent binocular vision, while the other three pairs of eyes offer peripheral vision, enabling them to detect movement and identify potential prey with remarkable precision.


The diet of these predatory arachnids mainly consists of insects, including flies, mosquitoes, and even other spiders. As voracious hunters, jumping spiders employ a unique hunting technique that involves stalking, pouncing, and utilizing their silk thread as a safety line in case they miss their target. This approach allows them to catch elusive prey such as agile, fast-moving flies.


Jumping spiders inhabit a wide range of ecosystems, from forests and grasslands to urban environments like gardens and homes. As a result, these adaptable creatures are on nearly every continent, with more than 5,000 species known to exist worldwide.


In terms of behavior, jumping spiders are solitary, diurnal hunters relying on their acute vision and incredible jumping ability to capture prey. Their remarkable leaps, powered by their strong, muscular legs, can span distances up to 50 times their body length. Furthermore, these nimble predators present intricate courtship displays, which often involve complex dances and vibrational signals to attract a mate.

Another interesting aspect of jumping spiders is their ability to recognize and learn from their environment. Studies show some species of jumping spiders identify the prey they encounter previously and adjust their hunting strategy accordingly. They are also capable of recognizing individual humans and can learn to associate certain people with positive or negative experiences.

Summary of 7 Natural Predators That Eat Flies

NumberPredator that Eats Flies
3Common House Spider
5Day Geckos
6Tyrant Flycatchers
7Jumping Spiders
Summary Table of 7 Natural Predators That Eat Flies

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About the Author

Lev is a writer at AZ Animals who primarily covers topics on animals, geography, and plants. He has been writing for more than 4 years and loves researching topics and learning new things. His three biggest loves in the world are music, travel, and animals. He has his diving license and loves sea creatures. His favorite animal in the world is the manta ray.

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