A new analysis of bat genomes and fossils is rewriting one of mammalian evolution's most enduring questions: where bats first emerged and how they spread across the planet. Researchers using reference genomes from living species alongside fossil evidence say the earliest bat lineage likely arose in Europe about 65 million years ago, near the dawn of the age of modern mammals.
The conclusion challenges a long-running debate in evolutionary biology, where bats have often been difficult to place because their fossil record is sparse and their anatomy is highly specialized. Bats are the only mammals capable of sustained flight, and that singular trait has complicated efforts to reconstruct their family tree. By integrating genetic data with fossil constraints, the new work offers a more coherent picture of how the group diversified after the mass extinction that ended the age of dinosaurs.
Ancient European Roots
The study's central claim is that early bats may have originated in Europe before dispersing to other continents. That interpretation is significant because it reverses assumptions that bats arose in tropical or subtropical regions farther south, where modern bat diversity is highest. Instead, the research suggests Europe may have served as an early evolutionary staging ground before bats spread into Asia, Africa and the Americas.
This matters beyond taxonomy. Biogeography — the study of how species and ecosystems are distributed across space and time — is increasingly central to understanding how life responds to climate shifts, continental drift and ecological opportunity. If bats did begin in Europe, their early expansion would have occurred during a period of major planetary change, when Earth was recovering from catastrophic extinction and new ecological niches were opening rapidly.
The study also underscores how modern genomics can sharpen questions that fossils alone cannot answer. Reference genomes provide a stable framework for comparing species, identifying shared ancestry and estimating divergence times. When paired with fossil evidence, they can reveal evolutionary relationships that are invisible in the living record.
Why Bats Matter
Bats are not just another branch on the mammalian tree. They are major pollinators, seed dispersers and insect predators, making them essential to ecosystem function in many parts of the world. Their ecological importance has become especially relevant as climate change, habitat loss and disease continue to pressure bat populations.
For climate and conservation scientists, the study offers a reminder that deep evolutionary history can inform present-day resilience. Species that survived dramatic environmental transitions in the past may hold clues about adaptation, migration and ecological flexibility. At the same time, modern bat populations face threats far more immediate than those that shaped their ancient origins, including deforestation, urban expansion and changing temperature regimes.
The research also arrives at a moment when scientists are increasingly using genomic tools to revisit old evolutionary puzzles. Similar methods have revised the histories of primates, birds and other mammal groups, showing that the combination of DNA and fossils can overturn assumptions built from incomplete evidence. In bats, where the fossil record is fragmentary and many lineages are highly derived, that approach is especially powerful.
Evolution Rewritten
The broader implication is that bat evolution may be more geographically dynamic than previously thought. Rather than emerging in a single stable region and radiating outward in a simple pattern, bats may have moved through ancient land corridors and changing climates in ways that left only partial traces in the fossil record. That makes the new study less a final answer than a stronger working model — one that will likely be tested as more genomes and fossils are added.
For now, the findings reinforce a broader lesson in science: the story of life on Earth is still being revised. As sequencing technology improves and paleontological discoveries accumulate, even familiar groups like bats can yield surprises that reshape the mammalian family tree. In this case, the surprise is profound — that the first bats may have taken flight from Europe, not from the regions many scientists once expected.
The study's timing is also notable for the climate and biodiversity debate. Understanding where species originated and how they moved across ancient landscapes can help scientists model how they may respond to future environmental change. In that sense, the bat story is not only about the past. It is also about the evolutionary capacities that may determine which species endure in a warming world.