The problem is not the bat, but how we interact with it
A new study in Communications Biology quietly dismantles one of modern epidemiology's most persistent myths: that bats, as a category, are harbingers of viral catastrophe. Analyzing nearly 900 mammal species and over a hundred known pathogens, researchers found that epidemic risk concentrates in just a few bat families — and that the true driver of zoonotic emergence is not the animal, but the human footprint pressing ever closer to it. The danger, it turns out, is less a question of biology than of geography, land use, and the choices societies make about how to share the world with other species.
- Decades of broad suspicion toward all bats have obscured a more precise and actionable truth: only three or four specific bat families carry meaningfully elevated epidemic potential.
- The urgency sharpens when high-risk bat ranges are overlaid with maps of human activity — Central America, South American coastlines, equatorial Africa, and Southeast Asia emerge as zones where the next spillover event is most plausible.
- A dangerous policy reflex — culling bats to reduce risk — is directly contradicted by the data; destroying roosts destabilizes populations and accelerates viral spread rather than containing it.
- The study offers a navigational tool: instead of impossible blanket surveillance, targeted monitoring of key families in key regions can concentrate limited public health resources where they matter most.
- The trajectory points toward ecosystem preservation as epidemic prevention — habitat protection, reduced agricultural encroachment, and wildlife surveillance forming a more coherent defense than fear-driven eradication.
For years, bats have served as the default villains of epidemic narratives — feared, blamed, and in some cases destroyed whenever a new virus surfaces. A study published in Communications Biology, led by researcher Caroline A. Cummings, argues that this framing is not only imprecise but counterproductive.
Analyzing data from nearly 900 mammal species and more than a hundred known viruses, the team mapped what they called "viral epidemic potential" — the likelihood that a pathogen could spread between humans, cause severe illness, and carry high mortality. When this risk was plotted across the mammalian evolutionary tree, bats as a whole did not emerge as uniquely dangerous. Instead, risk clustered in specific families: horseshoe bats (Rhinolophidae), and the widespread insectivorous groups Vespertilionidae, Molossidae, and Emballonuridae.
What makes these families consequential is not some inherent biological menace, but their adaptability to human-altered environments. Many roost in buildings, bridges, and urban infrastructure — placing them in frequent, unplanned contact with people. When the researchers overlaid the ranges of these high-risk species with maps of human land use, geographic hotspots crystallized: Central America, the coasts of South America, equatorial Africa, and Southeast Asia.
The study's most urgent practical message concerns culling. Killing bats does not reduce epidemic risk — it increases it. Disrupting stable roosts stresses populations and accelerates viral circulation. The more effective path runs in the opposite direction: protecting ecosystems, limiting habitat destruction, and building targeted surveillance systems focused on the families and regions where risk is genuinely concentrated.
The conclusion is both sobering and clarifying. Bats are not the problem. The problem is the shrinking distance between human activity and the wild systems that have always contained these viruses in equilibrium. Science now knows, with more precision than before, where to watch — and what not to destroy.
For years, bats have carried the weight of blame whenever a new virus emerges. They are the convenient villains in the story of epidemics—harbingers of disease, vectors of contagion, creatures to fear. But a new study published in Communications Biology suggests the narrative has been too simple. The real risk, it turns out, is not distributed evenly across all bat species. Some matter far more than others, and the danger lies not in the animals themselves but in how and where humans interact with them.
Researcher Caroline A. Cummings and her team analyzed data from nearly 900 mammal species and more than a hundred known viruses, searching for a pattern. They looked for animals linked to pathogens with three specific traits: the ability to spread between humans, the capacity to cause severe illness, and a tendency toward high mortality. When they mapped this "viral epidemic potential" onto the evolutionary tree of mammals, something unexpected emerged. Bats as a group did not stand out as uniquely dangerous. Instead, danger concentrated in a few specific branches.
Three bat families in particular showed elevated epidemic potential: the horseshoe bats, which belong to the family Rhinolophidae, and several widespread insectivorous groups—Vespertilionidae, Molossidae, and Emballonuridae. These are not rare or isolated creatures. Many are found across numerous countries, and some have adapted readily to human-altered landscapes, roosting in buildings, under bridges, and in other infrastructure. This proximity to people, rather than anything inherent to the bats themselves, is what raises the odds of contact and transmission.
The question of why these bats and not others points to the complexity of viral ecology. All bats harbor an enormous diversity of viruses and possess immune systems that tolerate infections that would devastate other mammals. This tolerance stems from adaptations tied to their evolutionary history and their capacity for flight. But each bat family maintains distinct relationships with the viruses it carries. Risk spikes when certain species overlap with landscapes heavily transformed by human activity. When researchers overlaid maps of high-risk bat distribution with maps of human impact, specific zones emerged: regions of Central America, the coasts of South America, equatorial Africa, and Southeast Asia. These are the places where vigilance matters most.
The study's practical contribution is methodological. Rather than generic warnings about all bats, it proposes targeted, evidence-based surveillance. Monitoring every animal is impossible; focusing resources on key groups and regions is not. The research also dismantles a dangerous assumption: that culling bats reduces epidemic risk. In fact, the opposite is true. Destroying stable roosts stresses bat populations and accelerates viral circulation, potentially increasing rather than decreasing the threat.
The core finding is stark. The problem is not the bat. It is how and where humans interact with bats. Habitat loss, monoculture agriculture, urban sprawl, and frequent contact are the true catalysts of risk. Protecting ecosystems, reducing pressure on wildlife, and strengthening disease surveillance prove far more effective than scapegoating animals that, moreover, provide essential services to agriculture and natural balance. There is no epidemic lurking around the corner. But science now knows where to look before one arrives.
Notable Quotes
The problem is not the bat, but how and where humans interact with it— Study findings led by Caroline A. Cummings
The Hearth Conversation Another angle on the story
If bats carry so many viruses, why aren't they all equally dangerous?
Because carrying a virus and transmitting it to humans are entirely different things. A bat's immune system is built to tolerate infections that would kill other mammals. The virus lives in the bat without harming it much. The real risk emerges only when a specific bat species, in a specific place, comes into frequent contact with people.
So the study is saying we've been blaming the wrong animals?
Not entirely. It's saying we've been blaming all bats equally, when only certain families actually show the pattern of being linked to human-transmissible, severe pathogens. The horseshoe bats and a few insectivorous groups—those are the ones worth watching. The rest are just living their lives.
And geography matters?
Enormously. A horseshoe bat in Southeast Asia, living near human settlements, is a different risk profile than the same species in an intact forest. The study identified hotspots—Central America, South American coasts, equatorial Africa, Southeast Asia—where high-risk bats and human activity overlap. That's where surveillance should concentrate.
What happens if we just kill the bats?
That's the dangerous part. Destroying their roosts stresses the populations and actually increases viral circulation. You're not eliminating the risk; you're amplifying it. The bats scatter, stressed, shedding more virus. It's the opposite of what you'd want.
So what's the actual solution?
Protect the ecosystems they live in. Reduce habitat loss. Improve disease surveillance in the hotspot regions. Don't let human activity push bats into closer contact with people. The virus isn't the problem—the collision between human expansion and wildlife is.