A mosquito hawk is not a mosquito, and despite the name, it doesn’t eat mosquitoes either. The insect most people call a “mosquito hawk” is actually a crane fly, a completely harmless bug that looks like an oversized mosquito but can’t bite, doesn’t carry disease, and has no interest in your blood. The two insects are only distantly related, and telling them apart is straightforward once you know what to look for.
What Is a Mosquito Hawk, Exactly?
The term “mosquito hawk” doesn’t refer to a single species. Depending on where you live, people use it to describe crane flies, dragonflies, or damselflies. In most of the United States, though, “mosquito hawk” (or “mosquito eater”) means a crane fly, a long-legged, fragile insect in the superfamily Tipuloidea. Crane flies range from 1/16 of an inch to about 1.5 inches long, with the larger species sporting wingspans up to 3 inches. They’re the gangly bugs that flutter around porch lights and bounce off walls in spring and fall.
Dragonflies and damselflies also get called mosquito hawks in some regions, and those insects actually do prey on mosquitoes. Crane flies do not. If you’re seeing a large, clumsy, drab-colored insect with extremely long legs bumping around your house, that’s a crane fly, and it’s the one this article focuses on.
How to Tell a Crane Fly From a Mosquito
At first glance, crane flies look like mosquitoes that hit a growth spurt. But the differences are obvious once you compare them side by side.
- Size: Crane flies are dramatically larger. A typical mosquito is roughly 1/4 inch long. Crane flies can be several times that size, with legs that seem absurdly long for their body.
- Legs: Crane fly legs are extremely delicate and break off easily, right at a natural fracture point between the leg segments. Mosquito legs are thin but proportionate to their small body.
- Mouthparts: This is the most important difference. Mosquitoes have a long, needle-like proboscis designed to pierce skin and draw blood. Crane flies lack this entirely. Some species have short mouthparts for sipping flower nectar, but most adult crane flies have no functional mouthparts at all.
- Flight: Mosquitoes are agile, quiet fliers that home in on targets with precision. Crane flies are clumsy, bouncing off surfaces and drifting toward light sources with no apparent coordination.
- Wings: Both have a single pair of wings (they’re both in the order Diptera, or true flies), but crane fly wings are proportionally larger and often held out to the sides at rest.
Do Mosquito Hawks Actually Eat Mosquitoes?
No. This is one of the most persistent insect myths, and it’s completely false. Adult crane flies don’t eat mosquitoes, and most don’t eat anything at all. Their adult lives are extremely short, often just a few days, and their sole purpose is to mate and lay eggs. The species that do have functional mouthparts may sip a bit of nectar, but none of them hunt or consume other insects.
The nickname likely stuck because people assumed something that looks like a giant mosquito must prey on smaller mosquitoes. It’s a satisfying idea, but there’s no truth to it. If you’re hoping crane flies will help control mosquito populations around your home, they won’t.
Can Mosquito Hawks Bite or Spread Disease?
Crane flies cannot bite you. They physically lack the mouthparts to pierce skin. They don’t sting, and they don’t transmit any diseases. If one lands on you, it’s simply resting. The panicky way they fly around rooms can make them seem threatening, but they’re one of the most harmless insects you’ll encounter indoors.
Mosquitoes, by contrast, are one of the most dangerous animals on the planet. Female mosquitoes feed on blood to develop their eggs, and in the process they can transmit malaria, dengue, Zika, West Nile virus, and other serious infections. This is the starkest difference between the two: one is a genuine health threat, and the other is a mild nuisance at worst.
Where Crane Flies Can Cause Problems
While adult crane flies are harmless, their larvae are a different story. Crane fly larvae are fat, grey, legless grubs called leatherjackets. They live in soil and feed on the roots, crowns, and shoots of grass. In lawns, high populations can cause noticeable thinning and brown patches, especially in early spring when the larvae are at their largest (up to 1.5 inches) and feeding most aggressively. Birds digging up your lawn are a telltale sign of a leatherjacket infestation.
Two invasive European crane fly species, originally from Europe and northern Africa, are now widespread across North America and are the primary culprits behind turf damage. Oregon State University Extension recommends checking for larvae if you notice thinning grass, and taking action if you find more than 25 larvae per square foot. Good lawn care practices come first: proper mowing, watering, fertilization, and improving soil drainage. If populations stay high despite those efforts, insecticide treatments work best when applied in winter, before the damage shows up in spring. Waiting until spring to treat is too late, because most of the feeding has already happened by then. Winter applications also reduce the risk of harming pollinators like bees and butterflies.
Insects That Actually Do Eat Mosquitoes
If you’re looking for a natural mosquito predator, dragonflies and damselflies are the real mosquito hawks. Both are skilled aerial hunters that catch and eat mosquitoes along with other small flying insects. Dragonflies are easy to distinguish from crane flies: they have stout, colorful bodies, four broad wings, and large compound eyes. They fly with speed and precision rather than the floppy, aimless flight of a crane fly.
Encouraging dragonflies near your property (they breed in ponds and other still water) can provide some natural mosquito suppression. But no single predator species eliminates mosquitoes on its own. Reducing standing water where mosquitoes breed remains the most effective step you can take.