Ancient Bees Found Nesting Inside Fossilized Bones
Thousands of years ago, in what is now the Dominican Republic, a cave full of bones became a surprising haven for bees. Researchers have made a groundbreaking discovery, revealing that bees utilized the jawbones of long-extinct mammals as burrows. The species of bee involved in this unique behavior remains unknown, but their smooth-walled nests were found nestled in the tooth pockets of ancient rodents and sloths. Lázaro Viñola López, a postdoctoral researcher at the Florida Museum of Natural History and one of the discoverers, expressed his astonishment at this unexpected find.
The cave, known as Cueva de Mono, was initially explored by Viñola López and his team in search of fossilized lizards, which they found in abundance. However, they also unearthed tens of thousands of bones belonging to extinct rodents and sloths. These findings led them to speculate that they had stumbled upon the hunting grounds of an ancient family of owls, which likely nested in the cave and regurgitated bones on the cave floor. While dating the fossils precisely is challenging, the species identified date back to the late Quaternary period, spanning over 125,000 years and including species that went extinct more than 4,500 years ago.
Within the empty tooth sockets of the rodent and sloth jawbones, researchers observed peculiar, smooth cup-like structures that were identified as bee nests. These nests featured hard, smooth walls created by a waterproof layer that solitary bees add to their brood cells, where larvae develop. The majority of bee species are solitary and typically nest in the ground, making this discovery of cave-dwelling bees a rare occurrence.
The researchers believe that the bees began using the bones shortly after the owls regurgitated them, possibly due to the thin soils in the surrounding forests. The bee-nest-filled bones were found across multiple soil layers, indicating long-term use of the cave by the bees. Some tooth cavities contained up to six different nests, suggesting communal nesting behavior among the bees.
The bones provided an additional layer of protection for the bees, shielding them from predators like parasitic wasps. This protective setup, akin to a thermos, featured an outer layer provided by the bone and an inner brooding cell within the sediment, offering double protection for the bees.
This groundbreaking discovery sheds light on a previously unknown behavior of ancient bees and showcases the intricate ways in which nature adapts and utilizes available resources. The study not only expands our understanding of bee behavior but also underscores the importance of preserving and studying fossilized remains to unravel the mysteries of the past.
