How many mosquitoes do bats eat? The number you see quoted everywhere — 1,000 mosquitoes an hour — comes from lab feeding trials, where a bat was released into an enclosure stocked with mosquitoes and nothing else. It is a ceiling, not a nightly field average, and this article works through what the arithmetic looks like once you put a colony in a real backyard.
If you are past the biology and ready to choose a habitat, start with the bat habitat buying guide for mosquito control.
Beyond controlling mosquitoes, bats play a vital role in keeping ecosystems balanced. Learn more about their importance in our post The Night Guardians: The Importance of Bats to Our World.
At Big Bat Box, we clearly believe in the benefits of bat habitats as insect control. So, what do the numbers actually say? Well, let’s dive in and take a look:
Are Bats Mosquito Eaters?
Yes. Bats are among the biggest insect eaters around. While other animals have laid claim to eating mosquitoes, most agree that bats work through the largest volume. The crane fly may be good, but the bat gets through more.
Other animals that eat mosquitoes include dragonflies, fish, birds, and some frogs. So bats certainly aren’t the only mosquito eaters around, but they do good job at it. Why? Sheer volume of insects consumed.
Want to invite these natural mosquito eaters to your backyard? Browse our Bat Houses that provide the perfect shelter for them to rest and roost safely.
Understanding What Bats Eat
Most bats have fairly strict diets that consist of a few things, but humans tend to only think of one: blood. Yep, many people think bats only consume blood due to our friend Dracula. This couldn’t be further from the truth.
In fact, there’s only a few species of bats that even drink blood. None of these species live in the United States. They’re found in Central and South America.
The rest of the 1,200 bats species tend to avoid drinking blood. These flying mammals prefer to eat things like bugs, mosquitoes, fruits, and fish.
How Many Mosquitoes Can Bats Eat?
Now we’re getting to the good stuff — and to the number that gets repeated without a caveat almost everywhere.
Bats may be smaller animals, but they certainly do eat a lot. Many a bat species can eat over 30% of their body weight in bugs in a single night of foraging.
Under lab conditions, with a bat placed in an enclosure full of insects and no competition, feeding rates of up to roughly 1,000–1,200 insects an hour have been recorded. Treat that as the ceiling, because that is what it is. In the wild a bat forages for a couple of hours, shares the airspace with the rest of the colony, and takes whatever is flying that night — so real totals sit well below the trial figure. Note also that the trial number is insects, not mosquitoes specifically.
Should You Believe the Hype?
Some argue that bats don’t make much difference to mosquitoes. Many claim that the only people crediting these flying mammals with insect control are the ones who advocate for bats in the first place. And they may have a point.
See, science has shown that mosquitoes only make up around 3% of the diet of most bat species. That’s a modest share. But we dug a little deeper here at Big Bat Box. Why?
Because we’ve had a number of customers write us saying how wonderful our bat houses are and how they help with the native mosquito population. Just look at what David from Colorado said:
"Your bat house came highly recommended from my brother in law. We last counted 70 bats,........ talk about bug control. We went from constantly needing bug spray to needing absolutely nothing - ever. Thanks for making and selling these!"
Only 3% of Their Diet?
One testimonial certainly doesn’t settle the question. We know that. So we kept thinking about it.
If mosquitoes only make up 3% of a bat’s diet, then why do bat habitats end up working? How does a colony change the mosquito pressure in a backyard?
Run the arithmetic and it becomes clear.
Let’s take a Big Bat Box for example. Our main habitat can hold up to 200 bats. If a colony forms, most users find 100-200 bats living in it. That’s pretty common. For simplicity, we’ll say 100 bats.
Now, these 100 bats may search for food 2-3 hours a night — give or take. Let’s stick with three hours.
And how many insects can each of them take in an hour? The lab ceiling is around 1,200. Let’s round down to 1,000.
Then we need to factor in how often a bat will eat a mosquito. As mosquitoes make up around 3% of the bat diet, that’s a straightforward number to apply.
100 bats × 3 hours × 1,000 insects × 0.03 = 9,000
100 bats eating 1,000 insects an hour for three hours is 300,000 insects a night. Mosquitoes at 3% of that brings you to 9,000 mosquitoes.
Why that 9,000 is a ceiling, not a forecast
Every input above is the best case. The 1,000 an hour is a lab rate, not a field rate. Three hours of solid foraging is generous. A hundred bats assumes a fully formed colony, which takes a season or more to build. Halve each of those and you land nearer 1,000 mosquitoes a night — which is still a real dent in the population around a single yard, and the honest version of the claim.
That is what natural control looks like: fewer mosquitoes, not none. A few weeks of steady colony activity and you notice the difference outdoors.
For a complete pest-free outdoor experience, check out The Definitive Guide to Backyard Mosquito Control. It explains how bats fit into a balanced mosquito management plan
How Many Mosquitoes Do Bats Eat? The Short Answer
There you have it. A single bat’s headline hourly figure is a laboratory ceiling, but a colony foraging every night through the warm months still removes mosquitoes at a scale no other backyard animal matches. If you have a backyard mosquito problem, a bat habitat is a sound part of the answer.
Click here to learn more about the Big Bat Box, the premier bat habitat on the market.
