For decades, one of the most enduring mysteries in evolutionary paleontology was the geographical origin of bats. Because their delicate, lightweight skeletons rarely survive in the fossil record, the early evolutionary history of the world's only flying mammals remained shrouded in speculation, with theories placing their ancestral roots in North America, Asia, or Gondwana.
That long-standing consensus has officially collapsed. In a landmark study published in Nature, an international team of evolutionary biologists and paleontologists leveraging advanced phylogenomics and high-resolution micro-CT fossil scans has established that bats originated in Europe approximately 65 million years ago, emerging in the immediate aftermath of the Cretaceous-Paleogene (K-Pg) mass extinction event that wiped out the non-avian dinosaurs.
The findings were widely reported by The Guardian, Live Science, and The New York Times.
The Breakthrough | Combining Genomes with Micro-CT Scans
The research team, led by geneticists from University College London and the Museum fur Naturkunde in Berlin, analyzed comprehensive genomic datasets spanning hundreds of living and extinct bat species alongside fossilized skeletal fragments recovered across Western and Central Europe. By pairing ultra-dense molecular clock models with 3D structural imaging of early Eocene fossils, researchers pinpointed the common ancestor of all modern bats (order Chiroptera) to Laurasian landmasses corresponding to modern-day Europe.
The methodology combined four key techniques. Whole-genome sequencing mapped DNA across more than 200 extant bat families, providing the genetic backbone for the analysis. Micro-CT scanning delivered high-resolution 3D interior mapping of fragile Paleogene fossil fragments that could not be safely examined by conventional means. Molecular clock analysis calibrated evolutionary mutation rates against geological boundary markers, anchoring the timeline. Finally, ancestral range estimation using ancestral state modeling reconstructed the likely geographical origin of the earliest bats.
This multi-method approach mirrors the advanced imaging and analysis techniques used in virtual unwrapping of ancient scrolls and the micro-CT analysis of fossilized coprolites, where non-destructive scanning reveals details invisible to the naked eye.
The Evolutionary Timeline | Radiating Post-Extinction
The timing of this origin places the emergence of early bat ancestors right at the boundary of the K-Pg extinction event, roughly 65 to 66 million years ago. Following the demise of the dinosaurs, the warm, densely forested canopy of early Paleogene Europe provided an ecological vacuum filled with flying insects. The ancestral protobat rapidly adapted from arboreal gliding to powered flight, swiftly diversifying into the two primary modern suborders: Yinpterochiroptera (which includes megabats and certain echolocating species) and Yangochiroptera (comprising the vast majority of echolocating microbats).
The earliest divergence between these two lineages occurred approximately 56 million years ago, with fully powered flight and laryngeal echolocation established globally by about 52 million years ago. This rapid radiation in the post-extinction world highlights the remarkable evolutionary opportunity presented by the vacant ecological niches left in the wake of the dinosaurs.
The post-extinction radiation of bats parallels the broader story of mammalian diversification that followed the K-Pg boundary, a theme explored in our coverage of the Hell Creek fossil record and the evolutionary transitions captured in cross-species companionship research.
Redrawing the Mammalian Map
The revelation that bats originated in Europe fundamentally alters broader models of post-extinction mammalian dispersal. Rather than migrating into Europe from North American land bridges during later thermal maximums, bats were indigenous inhabitants that radiated outward to populate every continent except Antarctica.
This finding underscores the importance of integrating genomic data with paleontological evidence. The fossil record alone could not settle the question, because bat skeletons are exceedingly rare and fragile. It was the fusion of molecular clock models with micro-CT imaging of existing fossils that finally resolved the geographic origin of Chiroptera. The resulting picture places Europe, not North America or Asia, at the center of the world's bat evolutionary story.
As lead authors noted during press briefings: "Discovering that the evolutionary roots of all bats trace directly back to ancient European forests redefines our understanding of mammalian resilience post-asteroid impact." The study demonstrates how the combination of genomics and paleontology can reconstruct the deep history of life, connecting to the broader work in our archaeology and paleontology coverage.
Frequently Asked Questions
The study's lead authors offered a memorable framing during press briefings: "It turns out Dracula's connection to Europe is far older than folklore, it is hardwired straight into the genetic history of the animal kingdom itself." Sixty-five million years after the first bats took flight in the ancient forests of Europe, their descendants have colonized every continent on Earth except Antarctica, a testament to the remarkable resilience of mammalian life in the wake of mass extinction.