What Do Bats Pollinate? From Wild Plants to Crops

Bats pollinate more than 500 species of flowering plants across the tropics and subtropics, ranging from towering baobab trees and wild agaves to commercially important crops like durian, pitaya (dragon fruit), and the agaves used to make tequila and mezcal. While bees and butterflies get most of the public credit for pollination, bats are the primary or sole pollinators for many plants that bloom at night, and their long-distance foraging habits make them uniquely effective at moving pollen between distant individuals. The relationship between bats and their partner plants runs deeper than casual flower visits, with both sides sporting remarkable adaptations shaped by millions of years of coevolution.

The Wild Plants That Depend on Bats

In tropical and subtropical ecosystems, bat-pollinated wild plants tend to share a recognizable set of features: large, pale or white flowers that open after dark, copious nectar, and a musky or fermented odor. These traits form what botanists call a “chiropterophilous syndrome,” and they show up across plant families that are otherwise unrelated, from cacti in the Sonoran Desert to vines in Central American rainforests to trees across sub-Saharan Africa.

Agaves are among the best-studied examples. In the wild, agaves put up a tall flowering stalk once in their lifetime, often reaching several meters high, and rely heavily on nectar-feeding bats of the genus Leptonycteris to carry pollen between plants.¹ Research on Agave palmeri found that in areas with very low or nonexistent bat populations, seed set dropped to less than five percent of its maximum potential, and a three-decade trend of declining seed set tracked closely with falling bat numbers.² Without bats, many wild agave populations would slowly lose the genetic mixing they need to stay healthy.

Baobab trees (Adansonia digitata), iconic across the African savanna, also depend on bat visits. Their large white flowers open in the evening and produce abundant nectar. A study in Benin found that bat-mediated pollination increased the fruit set rate of baobabs, making bats an important factor for the trees’ natural regeneration.³ Since baobab fruits, leaves, and bark are widely used for food and traditional medicine in sub-Saharan Africa, this ecological link matters for human communities too.

Tropical vines and lianas form another major group. The bat-pollinated liana Marcgravia longifolia, which climbs through neotropical forests, was found to have pollen dispersal distances up to 1,350 meters, with longer distances in the understory and midstory where bats forage most actively.⁴ That kind of long-range pollen movement prevents inbreeding and keeps tropical plant populations genetically robust in ways that shorter-range pollinators like insects often cannot match.

Crops and Commercially Important Plants

The jump from wild plants to agriculture is where bat pollination becomes a direct economic concern. Several tropical crops either require bat pollination outright or produce significantly better yields when bats visit their flowers.

Durian, the famously pungent fruit prized across Southeast Asia, is a prime case. An experiment in Sulawesi, Indonesia, found that durian flowers accessible to bats had significantly higher fruit set compared with flowers that were closed to all animal visitors or open only to insects. The cave nectar bat (Eonycteris spelaea) was the most active pollinator, visiting far more inflorescences and spending much longer per visit than the larger flying foxes that also showed up.⁵ Given that durian is a multibillion-dollar industry across Southeast Asia, the link between healthy bat populations and fruit production is not just ecological trivia.

Agave-derived products like tequila and mezcal represent another agricultural sector that intersects with bat pollination. Although modern tequila production largely bypasses natural pollination by harvesting agave plants before they flower and replanting from clonal shoots, this practice has consequences. It reduces food availability for bats and simultaneously narrows the genetic diversity of agave, making the crop more vulnerable to disease.⁶ In recent years, conservation groups and tequila producers have collaborated on “bat-friendly” certification programs, allowing a small percentage of agave plants to flower so bats can feed and cross-pollinate. Modeling suggests that letting just five percent of plants flower in one hectare could sustain millions of nectar-feeding bats per month during flowering season.⁷

Pitaya, or dragon fruit, and related columnar cacti across Mexico and Central America also rely on bat pollination. An economic valuation found that bat pollination services to pitaya production were worth roughly $2,500 per hectare through increases in both fruit yield and size, with bats contributing around 40 percent of gross income for producers.⁸ That figure gives a rare, concrete dollar amount to an ecological service that usually goes unpriced.

Wild bananas deserve a mention too, even though the supermarket bananas most people eat are parthenocarpic (they produce fruit without pollination). Wild banana species do require pollination to reproduce, and bats are among their visitors. Wild bananas are an important genetic reservoir because cultivated banana varieties, which are clones, are notoriously susceptible to disease. Maintaining bat-pollinated wild banana populations matters for long-term crop security.⁹

How Plants Attract Bats in the Dark

Plants that need bats to pollinate them face a basic challenge: their pollinators navigate by echolocation and smell, not sight. As a result, bat-pollinated flowers have evolved a suite of signals that are tuned specifically to bat senses, and some of these are strikingly creative.

Scent is a major cue. Chemical analyses of bat-pollinated flowers have identified dozens of volatile compounds, but sulfur-containing molecules stand out as especially important.¹⁰ Laboratory and field experiments showed that nectar-feeding bats are innately attracted to sulfur compounds like dimethyl disulfide, even without ever having been rewarded at flowers with those scents. In the tropical lowland rainforest of Costa Rica, artificial flowers laced with sulfur compounds successfully attracted wild bats to sugar water feeders.¹¹ To a human nose, these sulfur scents smell musty or even foul, which partly explains why bat-pollinated flowers are rarely described as fragrant in the way bee-pollinated flowers are.

Acoustic signaling adds another dimension. The tropical vine Marcgravia evenia has evolved a dish-shaped leaf that sits above its inflorescences and functions as an echo beacon for echolocating bats. The leaf produces strong, multidirectional echoes with a consistent signature. In behavioral experiments, the presence of these acoustic leaves cut foraging time in half for flower-visiting bats, essentially acting like a sonar billboard that says “nectar here.”¹²

Nectar itself is tailored to bat preferences. Bat-pollinated flowers tend to produce large volumes of dilute nectar that is rich in simple hexose sugars (glucose and fructose) rather than the sucrose-heavy nectar more common in bee-pollinated flowers. Nectar secretion typically peaks at night, aligning with bat activity patterns.¹³ The combination of generous nectar volume and low sugar concentration may reflect the high energy demands of hovering flight, which requires bats to refuel frequently throughout the night.

How Bat Tongues Are Built for the Job

Nectar-feeding bats have tongues that are engineering marvels. Two broad tongue designs exist among nectar specialists. Most species have tongues covered in hair-like papillae, while a smaller group has nearly hairless tongues with distinct lateral grooves that work by a pumping mechanism.¹⁴

The hairy-tongued strategy is better understood and frankly more spectacular. In the well-studied Pallas’s long-tongued bat (Glossophaga soricina), the tongue tip functions like a tiny blood-powered mop. When the bat dips its tongue into nectar, blood vessels within the tongue tip engorge, causing the filamentous papillae to become erect. The papillae stay erect as the tongue retracts, trapping nectar between the rows and carrying it into the mouth.¹⁵ The entire cycle happens in a fraction of a second, and bats can lap at flowers dozens of times per visit.

This constant contact with the interior of flowers means pollen literally showers onto a bat’s fur during feeding. Researchers have noted that in natural habitats, it is essentially impossible for a nectar-feeding bat to consume nectar without getting coated in pollen, and the subsequent grooming behavior (during which bats lick pollen off their fur and swallow it) provides a significant protein supplement to their otherwise sugar-heavy diet.¹⁶ The plant gets its pollen ferried to the next flower; the bat gets a protein meal. The transaction is efficient for both sides.

Why Bats Move Pollen Farther Than Most Insects

One reason bat pollination is so ecologically valuable is the sheer distance bats travel. A foraging bee might work flowers within a few hundred meters of its hive, and even large carpenter bees or hawk moths rarely carry pollen more than a kilometer. Nectar-feeding bats, by contrast, can range across several kilometers in a single night, visiting flowers scattered across a landscape. This long-range foraging translates directly into long-distance pollen flow.

The Marcgravia longifolia study mentioned earlier illustrates this: pollen was detected up to 1,350 meters from the source plant, and the researchers found no detectable spatial genetic structure, meaning bat pollination was mixing genes so effectively across the forest that nearby plants were no more closely related than distant ones.⁴ For plants that grow in fragmented habitats or at low densities, this long-distance gene flow can be the difference between a healthy population and one headed toward inbreeding depression.

The energetic cost of this lifestyle is substantial. Hovering at a flower demands about 32 watts per kilogram of body mass for a small nectar bat, compared with roughly 12 watts per kilogram for forward flight at cruising speed.¹⁷ That makes hovering about two and a half times more expensive than flying between flowers, which explains why nectar-feeding bats need to visit many flowers each night and why plants compensate by producing generous nectar volumes.

Islands and the Double Mutualism Problem

On islands, the ecological stakes of bat pollination get even higher. Many island bat species serve a “double mutualism” role: they pollinate flowers and also disperse seeds from the fruits they eat. If one of these bat species is lost, the cascading effects hit both the plant’s ability to reproduce through pollination and its ability to spread seeds to new locations. A global analysis of this double mutualism phenomenon found that it is especially prevalent on islands, where fewer animal species are available to fill these roles. Combined with the already elevated threat status of many island species, the loss of a double mutualist bat could severely disrupt island ecosystem functioning.¹⁸

This is not an abstract concern. Island flying foxes, some of the most important pollinator-disperser bats, are hunted for bushmeat in parts of the Pacific and Southeast Asia, and their roost sites are frequently disturbed. When an island loses its flying fox population, the ripple effects move through the entire plant community in ways that insects alone cannot compensate for, because insects generally cannot carry pollen as far and do not disperse seeds at all.

Tracking What Bats Actually Visit

For decades, figuring out which plants a given bat species pollinates required painstaking observation: researchers would sit at flowering plants with night-vision equipment and record visits, or they would examine pollen grains found on captured bats under a microscope. Both methods are slow and limited in scope.

DNA metabarcoding has changed the game. By extracting DNA from pollen on a bat’s fur, from fecal samples, or even from swabs of the bat’s muzzle, researchers can identify every plant species the bat interacted with. An evaluation of these methods found that metabarcoding is a powerful, high-throughput tool for understanding bat ecology and species interactions, though careful analysis is needed because contamination and amplification biases can skew results.¹⁹ The technique has already revealed bat-plant interactions that field observation never caught, including visits to plant species no one expected bats to pollinate.

Why Bat Pollination Is Undervalued

Bat pollination probably matters more to global agriculture and wild ecosystems than most people realize, and a persistent image problem is partly to blame. Public perception of bats has historically been negative, with bats commonly associated with disease and vampire lore rather than with the ecological services they provide.²⁰ The COVID-19 pandemic intensified this bias. A large survey found that 84 percent of respondents misunderstood the relationship between bats and the virus, which strengthened negative attitudes and likely contributed to increased evictions of bats from buildings and even legislative proposals for culling wildlife in China.²¹

This matters for pollination because habitat destruction, roost disturbance, and direct persecution all reduce bat populations, and declining bat numbers translate directly into reduced pollination services. Monitoring data from Thailand documented declining visitation rates by some bat pollinator species over a decade of observation.⁹ When fewer bats visit, fruit and seed production fall, wild plant populations lose genetic diversity, and farmers who depend on bat-pollinated crops see lower yields.

The dollar figures that exist are compelling but patchy. We know bat pollination is worth roughly $2,500 per hectare for pitaya growers in Mexico and is the deciding factor in durian fruit set in Indonesia, but equivalent valuations for most other bat-pollinated crops simply have not been done. The difficulty of studying nocturnal pollinators, combined with the general public indifference or hostility toward bats, means the economic case for protecting bat pollination services is still being built one crop at a time. For anyone who enjoys tequila, durian, dragon fruit, or products made from baobab, the picture is clear enough: healthy bat populations are part of what makes those foods possible.