Bats Challenge Evolution Five Ways
Bats break expectations of longevity compared
to other mammals their size and scientists are
intrigued about the processes involved
New Bat Research Undermines Evolutionary Predictions
by Dr. Sarah Buckland-Reynolds
Bats are one of those creatures that when I even catch a glimpse of them, it sends shivers down my spine and I dart away for safety! While others may admire bats (partly because of the superhero character patterned after them), bats are indeed ‘super creatures’ in many ways we may not realize.
Insights into longevity and virus-driven adaptation from Myotis bat genomes (Vazquez et al., Nature, 26 August, 2026).
This paper highlights just how bats appear to break many rules of biology. Despite their small size, some species live for decades, resist cancer, and tolerate viruses without getting sick. These traits violate numerous predictions from evolutionary assumptions. So amazing are the new findings that Vazquez et al (2026) even posit that these creatures (as terrifying as they may be to some), may hold clues to healthier, longer human lives! Their unusual mix of longevity, immune resilience, and ability to host viruses safely makes them one of the most extraordinary mammals in creation.
Combatting Evolutionary Predictions
Vazquez et al’s study focuses on a peculiar genus of Myotis bats, as the species within this genus display a broad variety of lifespans that intrigued the researchers, ranging up to about a half a century. From the outset of the study, Vazquez and colleagues frame the evolutionary story of the genus in the following way:
“Since their emergence 60 million years ago… many bat lineages have independently evolved a wide variety of life history strategies and phenotypic traits, including exceptional longevity, viral tolerance and immune defences… Systems in which shared traits have evolved de novo multiple times are powerful resources for dissecting the genetic basis of phenotypes. The largest genus of bats, Myotis, emerged approximately 33 million years ago…and encompasses over 139 described species spanning 6 continents and a wide range of ecological niches”
Despite this evolutionary anchor, the very aspects of the Myotis genus that fascinated the researchers directly challenge several predictions that evolutionary theory would normally make about lifespan, immunity, and adaptation. The following sections elaborate on five key challenges to evolutionary predictions.
Challenge One: Failed Prediction of Allometric Scaling
Bats’ lifespans increase without body-size changes
Allometric scaling is a biological principle that describes how traits such as lifespan, metabolism, or heart rate change in proportion to body size across species based on its assumed relationship with body sizes, live longer. Evolutionary theory expects these scaling relationships to hold because natural selection shapes traits in line with energy use and survival. Larger animals invest more in maintenance and repair, while smaller animals invest in rapid reproduction.
However, the study found that this simplistic evolutionary prediction did not hold for bats. In the words of the authors: “some of the largest and most-rapid changes in lifespan across mammals in bats,” despite little change in body size. Specifically, within the genus Myotis, Myotis brandtii lives 42 years, while a close relative lives only 7 years. Evolutionary explanations struggle to account for how bats repeatedly “jump” lifespan categories without the expected body size changes.
Challenge Two: Bats show a surprising reversal in how they adapt to viruses
In most mammals, including humans and primates, the helpful genetic changes that stick around are usually in genes that deal with RNA viruses such as influenza, HIV, and coronaviruses, because RNA viruses are considered the main evolutionary pressure. However, Vazquez et al. (2026) reported that:
“VIP [Virus Interacting Protein] adaptation in Myotis and other bats is driven by selection only in DNA VIPs… in contrast to the observed pattern in RNA VIPs, which show no evidence of genome-wide enrichment in adaptation.”
In simple terms, bats’ immune systems have been shaped mainly by DNA viruses, not RNA viruses. This complete inversion of the expected pathway shows bats follow a unique, nongradual trajectory that evolutionary theory did not predict, since it assumes similar viral pressures across all mammals.
Challenge Three: PKR Duplications Defy Evolutionary Predictions
Vazquez and colleagues also elaborated on another process that implicitly places evolutionary theory into further question, involving a special gene called Protein Kinase R (PKR). PKR (Protein Kinase R) is a gene that works like a sensor in helping cells fight viruses. When it detects viral RNA inside a cell, it switches on and shuts down the cell’s protein-making machinery, stopping the virus from multiplying.
The trade-off that occurs is that, when PKR is duplicated, hypothetically, toxicity can arise because it also increases the chance of protein shutdown happening unnecessarily or too strongly. Normally, if a gene is duplicated in a way that harms the cell, evolution predicts that duplication should disappear over time. Neutral duplications might drift, but harmful ones should be purged. Yet in bats, PKR duplications have persisted across species for “tens of millions of years, representing an ancient trans-species polymorphism.”
By evolutionary logic, since extra copies of PKR would likely make cells more toxic, these costly duplications should have been eliminated. However, Vazquez and colleagues show that bats still carry them, balancing viral defense against cell toxicity. This persistence directly contradicts the expectation that harmful traits are removed.
At first glance, keeping possible toxicity may seem like a poor design. However, in the case of the bats, the toxicity is not uncontrolled, but forms part of a trade-off system well suited for the environments that bats inhabit. As bats face constant viral exposure, stronger defense is critical. Despite the potential adverse effect of shutting down protein multiplication, the persistence of PKR duplication in bats provides enough PKR to fight viruses, but not so much that toxicity overwhelms the organism, producing a controlled tension that produces resilience.
While in a “very good” original creation, such costly trade-offs may not have been necessary. After the Fall, though, when disease and death entered, mechanisms like PKR duplications could become part of survival strategies. What looks toxic now may have been neutral or dormant before. Could this suggest planned intentionality activated after the Fall rather than chance evolutionary mechanisms?
Challenge Four: Programmed cell death in bats contradicts repair-first expectations
Vazquez and colleagues’ observations further violated evolutionary predictions as they found that the bats pruned damage cells instead of repairing them. This was most evident in the little brown bat (Myotis lucifugus). Evolutionary theory predicts cells should prioritize repair to preserve tissue function, because keeping more cells alive should be advantageous. This predicted ‘repair-first’ mechanism is observed in most animals, with bats being only one of few exceptions, such as elephants.
Instead of preservation, though, Vazquez et al. described this process of programmed cell death (also called apoptosis) in the following way in a commentary article published by the University of California, Berkeley,:
“For the study, Vazquez cultured cells he biopsied from the wings of the bats. (He currently has cell cultures from 259 individuals representing 32 species.) When he treated cultured bat cells with toxic chemicals, he found an unusual response: for the longest lived bat in his sample, the widespread little brown bat (Myotis lucifugus), the toxin didn’t trigger activation of genes for DNA repair proteins, but rather up-regulated genes promoting cell death.
“We found the literal opposite of what we expected if you treat the bats with a lethal dose of this chemical,” he said. “The longest-lived bat in North America decides ‘I can’t save this ship’ and immediately switches gears to prioritize killing off the cells that are damaged. The elephant, another cancer-resistant species that is long-lived, has the exact same strategy — if you can’t save the cell, kill the cell.”
This approach of cell death (also called “apoptosis-first”) has been recognized as a radical cancer defense. However, it is counterintuitive from an evolutionary standpoint since it sacrifices cells rather than conserving them. What makes it especially a problem for evolutionary explanations is that the system only works when integrated with other bat adaptations, showing a coordinated design rather than a gradual, piecemeal change.
Challenge Five: Bats’ immunity and longevity are interconnected in a way gradual evolution cannot explain
Evolution predicts that traits evolve independently, and that therefore, aging, and viral defense are separate processes. However, Vazquez and colleagues concluded that these two processes may likely go hand in hand. In their own words:
“Together, our results suggest that bats’ remarkable longevity and immunity are linked through pleiotropic adaptations to viruses and ageing-related disease.”
Explaining further in the UC Berkeley press release, the authors note:
“The longer-lived bats had higher levels of genes associated with fighting cancer.”
In other words, the same genetic pathways that help bats live longer also protect them from disease. However, while this works efficiently, evolutionary explanations do not account robustly with this issue (also called ‘pleiotropy’) because it requires multiple traits to evolve simultaneously. Stepwise accumulation cannot easily produce systems where one gene serves multiple critical functions. In contrast, special creation can account for this interdependence.
Each of these observations undermines the gradualist, independent-trait framework of evolutionary biology. Instead, they point to a well-engineered, interconnected system.
Benefits of Bat Biology Beyond Bats
Why do bats possess these traits that make them unique among other mammals? While biological traits may not have the direct answers, we can infer from bats’ lifestyles how useful these traits may be. For instance, the nightly flights that bats make demand extraordinary endurance, comparable to running ultra-marathons. Their ecological role as insect controllers also requires long lifespans to sustain populations. Their immune systems, constantly active, allow them to host viruses without illness.
While the authors attribute these differences to evolution, the paper just mentions this as self-evident without examining whether evolutionary mechanisms could reasonably produce these. As Vazquez stated in the UC Berkeley press release:
“Bats have evolved this incredible fitness capacity, this incredible ability to deal with disease and this incredible ability to be able to prevent cancer.”
For humans, these biological systems inspire innovation, but innovation requires intelligence. This discovery and ongoing research may now unlock new therapies for cancer, aging, and viral infections. Their biology offers a blueprint for resilience that medicine has only begun to explore.
Intelligent Design Reflections
While the designed functions of bats may have significantly changed since the creation after the Fall, it is evident that these creatures seem to have been pre-engineered suitably with unique capacities, with resilience built into their systems, even before death, disease, and viruses became part of the creation.
The biology of bats directly challenges evolutionary assumptions and simultaneously inspires new medical possibilities. For believers, they also testify to God’s wisdom in creation. Future research will continue to uncover these secrets, showing that even in the smallest creatures, God’s handiwork is profound. Each new discovery reminds us that creation is purposeful, designed for life and resilience.
See also:
- “Probably Evolved” Is Batty Science (11 April 2022)
- Bats Defy Evolution (22 March 2021)
- Bat Evolution? Still Looking (8 May 2020)
- Bat Designs Tainted by Batty Evolution Stories (12 Feb 2018)
- Bat Evolution: The Play’s the Thing (23 Dec 2008)
- Oldest Bat Fossil: Was It Evolving? (16 Feb 2008)
Dr. Sarah Buckland-Reynolds is a Christian, Jamaican, Environmental Science researcher, and journal associate editor. She holds the degree of Doctor of Philosophy in Geography from the University of the West Indies (UWI), Mona with high commendation, and a postgraduate specialization in Geomatics at the Universidad del Valle, Cali, Colombia. The quality of her research activity in Environmental Science has been recognized by various awards including the 2024 Editor’s Award from the American Meteorological Society for her reviewing service in the Weather, Climate and Society Journal, the 2023 L’Oreal/UNESCO Women in Science Caribbean Award, the 2023 ICETEX International Experts Exchange Award for study in Colombia. and with her PhD research in drought management also being shortlisted in the top 10 globally for the 2023 Allianz Climate Risk Award by Munich Re Insurance, Germany. Motivated by her faith in God and zeal to positively influence society, Dr. Buckland-Reynolds is also the founder and Principal Director of Chosen to G.L.O.W. Ministries, a Jamaican charitable organization which seeks to amplify the Christian voice in the public sphere and equip more youths to know how to defend their faith.