Updated: May 17, 2023

Flies are some of the most common insects we see in our environment. They are everywhere, from our homes to the outdoors, and they can be quite a nuisance. Flies are not only annoying, but they can also be dangerous as they transmit diseases. However, flies are not invincible. Just like any other living creature, they have natural predators that keep their population in check. In this article, we will discuss some of the natural predators of flies.


Spiders are one of the most common natural predators of flies. They are known for their ability to spin webs that trap flies and other insects. Once a fly gets trapped in a spider’s web, the spider will immediately attack and inject venom into the fly. The venom will immobilize the fly and start to liquefy its internal organs, making it easy for the spider to suck out its fluids.

Not all spiders spin webs to catch their prey. Some actively hunt for their food, and flies are part of their diet. For example, jumping spiders are known to hunt and eat flies. They are agile hunters that can jump several times their body length to catch their prey.


Birds are another natural predator of flies. They feed on a variety of insects, including flies. In fact, some bird species have evolved to specialize in catching flies. For example, swallows are known for their aerial acrobatics as they chase and catch flying insects, including flies.

Other bird species that eat flies include bluebirds, chickadees, and warblers. These birds usually catch flies by hovering in mid-air or perching on a branch and waiting for a fly to pass by.


Bats are nocturnal animals that feed on insects, including flies. They use echolocation to find their prey in the dark and can consume thousands of insects in a single night. Some bat species are known to specialize in catching flies, and they use their sharp teeth to crush the insects’ exoskeletons before swallowing them.


Frogs are not only cute to look at, but they also play an essential role in controlling fly populations. They feed on a variety of insects, including flies. Some frog species have long, sticky tongues that they use to catch flies and other flying insects. Other frog species have a more active hunting style and will jump and catch their prey with their mouths.


Dragonflies are fascinating insects that are known for their agility and speed. They are also natural predators of flies. Dragonflies have two pairs of wings that they can move independently, allowing them to hover in mid-air and change direction quickly. They use this ability to catch flying insects, including flies.

Dragonflies have strong mandibles that they use to crush their prey’s exoskeletons before consuming them. They are also known to be territorial and will defend their hunting grounds against other dragonflies.


Ants are social insects that work together to hunt and gather food. They are also natural predators of flies. Some ant species, such as army ants, have large mandibles that they use to catch and kill flies. Other ant species, like pavement ants, will scavenge for dead flies or other insects.

Predatory Insects

There are many predatory insects that feed on flies. Some of these include:

  • Assassin bugs: These insects have long, curved mouthparts that they use to pierce their prey’s exoskeletons and inject venom.
  • Praying mantises: These insects have powerful front legs that they use to catch and hold onto their prey while they consume it.
  • Lacewings: These insects have delicate, lacy wings that give them their name. They feed on small insects, including flies.
  • Ladybugs: These beetles are known for their bright colors and spots. They feed on aphids, but they will also eat flies if given the opportunity.


Flies are not invincible, and they have many natural predators that help keep their populations in check. Spiders, birds, bats, frogs, dragonflies, ants, and predatory insects all play an essential role in controlling fly populations. If you’re tired of dealing with flies in your home or garden, consider attracting some of these natural predators to your property. By doing so, you can enjoy a fly-free environment without relying on harmful chemicals or pesticides.