# 47-Million-Year-Old Owl Fossil Challenges Nocturnal Evolution Theories A perfectly preserved fossil suggests early owls were active during the daytime. - **Source:** [Latest from Live Science](https://www.livescience.com/feeds.xml) - **Published:** 2026-11-06 - **Topic:** [science](https://brifing.si/c/science) - **Original article:** - **On Brifing:** https://brifing.si/s/d5d9b95c-f8c0-461e-9306-62d7fdcb3c42 ## Discovery of Masillastrix blattophaga Researchers discovered a remarkably preserved fledgling owl fossil in the Messel Pit, Germany, dating back 47 million years. Named Masillastrix blattophaga, this specimen provides rare insights into the Eocene epoch. Although the skull is missing, the rest of the skeleton remains intact, offering a unique window into early avian life and evolutionary history. ## Evidence of Diurnal Activity The fossil contained a greenish-blue, iridescent cockroach in its stomach, a key indicator of daytime activity. Iridescence in insects is typically associated with diurnal environments. This finding suggests the small, 12-centimeter-long owl hunted during the day, contradicting the assumption that all ancient owls shared the nocturnal habits of their modern descendants. ## Anatomical Clues in Wing Bones Paleontologist Gerald Mayr highlights that the owl's stout humeri, or upper wing bones, differ significantly from the slim, elongated bones of modern nocturnal owls. These stocky bones suggest the bird did not require the silent flight mechanisms necessary for night hunting, further supporting the theory that this species was primarily active during daylight hours. ## Refining the Evolutionary Timeline Current evidence indicates that owls likely transitioned to nocturnal lifestyles between 47 million and 35 million years ago. While the oldest known owl fossil dates back 60 million years, the shift appears to have occurred much later. This timeline helps scientists narrow the window for when these birds adapted to hunting at night. ## Challenging Previous Scientific Theories Previous hypotheses suggested owls became nocturnal to avoid competition with other birds of prey or to exploit nocturnal mammals. However, these groups did not proliferate until 20 to 25 million years ago. This discrepancy creates a new mystery, as the drivers for the nocturnal transition remain unclear despite the refined temporal data. ## The Significance of Messel Pit The Messel Pit serves as the world's richest fossil site for understanding the Eocene epoch, spanning 56 to 34 million years ago. This ancient lake environment provides exceptional preservation conditions, allowing researchers to identify specific prey items like the cockroach found in the owl's stomach, which was also found in nearby sediments. ## Evolutionary Ancestry of Owls There is a broad consensus among paleontologists that owls evolved from diurnal ancestors. Early fossils display head-rotation structures and bony ridges above eye sockets similar to modern diurnal raptors. These features likely provided protection from the sun, reinforcing the idea that the transition to nocturnal behavior was a later evolutionary development. ## Future Research and Implications While the exact reason for the nocturnal switch remains unsolved, this discovery provides a crucial temporal anchor for future studies. By narrowing the timeframe, researchers can better investigate environmental or ecological pressures that triggered this behavioral change. Every new fossil discovery continues to reshape our understanding of early modern bird evolution. ## Sources covering this story - https://www.livescience.com/animals/birds/perfectly-preserved-owl-fossil-from-47-million-years-ago-could-help-to-solve-a-major-evolutionary-mystery — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._