Bats do not all eat the same thing. Many hunt insects, while other species feed on fruit, nectar or pollen; some catch fish or small animals. A small group drinks blood. Insect-hunting bats often find prey by echolocation: they send out high-frequency calls and listen for the echoes that return. The details depend on the bat’s species and the food it is looking for.
What do bats eat?
A bat’s diet depends on its species. Insects are a common food, but “bats eat bugs” is only part of the picture. Bat Conservation International’s FAQ describes bats that eat insects, fruit, nectar, fish, frogs and other small animals, as well as the three vampire bat species that drink blood. The U.S. Geological Survey also describes insect-eating as the majority strategy among bats worldwide, alongside specialized diets such as fruit, nectar, blood, fish and small mammals.
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Bat Conservation International said in a July 22, 2021 article that around 75% of the world’s bats eat insects. That is an attributed, approximate figure from that article, not a claim that every bat eats insects or a fixed count that applies regardless of later changes in species classification. Its FAQ describes more than 1,400 bat species and identifies three vampire bat species; global totals can change as taxonomy changes.
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Insects
Many bats catch insects, making moths, beetles and other flying insects important prey for insect-hunting species. The exact prey varies by bat and circumstances; the broad fact is that insectivory is widespread, not that every insect-eating bat targets the same insects. Insects are usually hunted in flight at night, and echolocation helps many of these bats detect and track them in darkness.
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The U.S. Geological Survey estimates that a little brown bat can eat 4 to 8 grams of insects in a night. That number applies to the little brown bat, not to bats as a group. It is a useful indication that a small animal can consume a substantial amount relative to its size, but it should not be converted into a universal nightly allowance or assumed to describe every individual on every night.
Fruit, nectar and pollen
Some bats feed on fruit; others visit flowers for nectar or pollen. These diets connect bats to plants in ways that differ from insect hunting. Fruit-eating bats may disperse seeds, while nectar-feeding bats can pollinate plants as they feed. Those roles belong to the bats and plants involved, rather than to all bats indiscriminately.
Fish and other small animals
Some species take animal prey beyond insects. Bat Conservation International lists fish, frogs and other small animals; the USGS also notes fish and small mammals among specialized diets. These examples show the range of bat feeding strategies, not a menu shared by every species. A bat that catches fish or small animals should not be treated as representative of the many bats that feed primarily on insects, fruit or nectar.
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Blood
Only three bat species are vampire bats, according to Bat Conservation International’s FAQ, and those species drink blood. Blood-feeding is therefore a specialized diet, not a typical bat food. The word “vampire” can loom large in stories about bats, but it describes a tiny part of the diversity of bat diets.
How do insect-hunting bats find food?
Many insect-hunting bats use echolocation. They emit high-frequency sounds, often above the range people can hear, then listen for sound waves that bounce back from objects. The returning echoes provide information the bat can use to detect and locate prey while flying at night. The National Park Service explains this basic process as ultrasound calls returning to finely tuned ears.
Echolocation is particularly relevant to insect-hunting bats searching for small prey in darkness. It is not a complete explanation of how every bat finds every kind of food. Bats with different diets may use different combinations of senses and feeding adaptations, and the evidence here does not establish one universal method for all bat species.
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From a call to a catch
- Send out calls. A bat makes high-frequency calls as it flies. The sounds travel through the surrounding air and can bounce off objects, including potential prey.
- Listen for returning echoes. The bat’s ears receive the echoes. Changes in the returning sound help it detect that an object is nearby and guide it toward prey.
- Refine the search. When an insect is detected, a bat can produce calls in a rapid sequence known as a “feeding buzz.” The National Park Service describes this burst of calls as helping the bat pinpoint its prey.
- Catch the insect. A bat may swoop toward prey and trap it with its wing or tail membranes, then reach down to take it into its mouth, as described by the USGS. This is one account of insect capture; it does not describe how every bat eats every kind of food.
The feeding buzz is a particularly vivid part of the process: the bat increases the pace of its calls as it closes in on prey. It helps explain how an insect hunter can keep tracking a small, moving target rather than simply flying toward a sound once and hoping to catch it.
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Echolocation is not a catch-all answer to the title question. The described call-and-echo sequence and feeding buzz explain how many insect-hunting bats locate and capture insects. They do not, by themselves, explain every bat’s search for fruit, nectar, fish or other prey. Those diets involve species-specific ways of finding and taking food, and a single account of insect hunting should not be generalized to all bats.
For a reader trying to identify what a bat eats, the useful first question is which species is involved. A bat feeding at a flower, taking fruit, catching an insect or pursuing fish is drawing on a different food source, and its foraging behavior should be understood in that context. The information available here supports those broad categories and the ecological roles associated with them; it does not provide a species-by-species guide to the senses or techniques used for each food.
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Why bat diets matter to ecosystems
A bat’s diet can affect more than the bat itself. The National Park Service describes several ecological roles tied to specific food sources:
- Insect-eating bats consume insects. Insectivorous bats hunt insects, including insects that can eat or damage crops. In a USGS feature, bat researcher Paul Cryan said: “People often ask why we should care about bats, and evidence strongly suggests that bats are saving us big bucks by gobbling up insects that eat or damage our crops,” The feature adds: “It is obviously beneficial that insectivorous bats are patrolling the skies at night above our fields and forests, and these bats deserve help.” These statements concern insectivorous bats and their role in fields and forests; they are not a claim that every bat species provides insect control.
- Nectar-feeding bats pollinate plants. As these bats visit flowers to feed, they can transfer pollen. This service is associated with nectar-feeding bats, not with all bats.
- Fruit-eating bats disperse seeds. Bats that eat fruit can help spread seeds, linking their feeding to plant reproduction and dispersal.
These roles are connected to diet: insect consumption, pollination and seed dispersal are different outcomes of different feeding strategies. Calling bats beneficial can be accurate, but the reason depends on what a particular species eats.
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What the numbers and examples do—and do not—tell you
The available figures are easy to overstate unless their scope stays attached to them. Bat Conservation International’s estimate that around 75% of bats eat insects comes from its July 22, 2021 article. It is an approximate global description, not a statement that all bats are insectivores. The USGS figure of 4 to 8 grams per night is an estimate for a little brown bat, not an average for the world’s bats. And Bat Conservation International’s description of more than 1,400 bat species and three vampire bat species is attributed to its FAQ; the global species total may shift as classifications change.
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These examples answer different questions. The approximate percentage describes how common insectivory is across bats; the little brown bat figure gives a species-specific nightly estimate; and the vampire bat count distinguishes blood-feeding specialists from the rest. None should be used to predict the exact diet or nightly food intake of an unidentified bat.
Can you hear a bat finding its food?
People generally cannot hear the high-frequency calls used in echolocation unaided. Bat Conservation International suggests taking an evening walk with a bat detector for those who want to listen to bat calls. A detector is an optional way to observe activity; it is not needed by bats to find food. Calls detected during a walk can show that bats are active, but hearing a call alone does not identify what the bat is eating or prove that it has caught prey.
Bat Conservation International’s article names a personal detector that connects to an Android phone or tablet and records calls through an app. Device availability and compatibility can change, so check current product information and whether the equipment works with your phone before relying on it. A detector is an observation aid, not a substitute for identifying the species or watching its feeding behavior.
How to interpret a bat’s feeding behavior
Seeing a bat fly at night does not reveal its diet by itself. It may be hunting insects, traveling between roosting and feeding areas, or looking for another food source. To make a sound inference, distinguish what is directly observed from what is known about the species:
- If an insect is caught in flight, that observation supports insect feeding in that instance; it does not prove every bat nearby eats the same prey.
- If a bat visits flowers, nectar-feeding is a relevant possibility, and nectar-feeding bats can contribute to pollination.
- If it feeds on fruit, seed dispersal may be part of its ecological role.
- If the species is not identified, avoid assuming its diet from the fact that it is a bat. The group includes multiple feeding strategies.
The most reliable broad rule is to connect diet, foraging behavior and ecological role to the species or feeding group being discussed. Insect hunters, fruit-eaters, nectar-feeders and the few vampire bats are not interchangeable examples.
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