Bearded vulture nests preserve 700 years of artifacts

Researchers examined 12 abandoned bearded vulture nests in southern Spain, discovering 226 human-made artifacts among 2,483 total remains, including a complete esparto grass sandal dated between 652 and 696 years old—making it a 14th-century artifact.iflscience
The nests, preserved in cliff caves where the vultures vanished 70 to 130 years ago, contained medieval artifacts including decorated sheep leather approximately 650 years old, a 150-year-old basket, weapons like a crossbow bolt and wooden lance, and parts of a slingshot.iflscience
Scientists also catalogued 2,117 bone remains, 86 hooves, and 43 eggshells that provide insights into historical ecosystems, dietary habits, and environmental conditions spanning centuries.iflscience
The cliff caves’ stable microclimates acted as natural museums, preserving materials added by successive generations of bearded vultures that reused the same nests over decades and centuries.iflscience
The findings could aid conservation efforts for Europe’s most threatened vulture species, with only 309 breeding pairs remaining, by enabling toxicological studies of eggshells to trace pesticide exposure and understand the species’ extinction in southern Spain.iflscience

Bearded Vulture Nests Reveal Centuries of Human Artifacts

Researchers in Spain have uncovered a treasure trove of centuries-old human artifacts in abandoned bearded vulture nests, transforming these structures into unexpected archaeological goldmines. The findings, published October 1 in the journal Ecology, reveal how these threatened birds have served as inadvertent museum curators for nearly 700 years.iflscience

Between 2008 and 2014, scientists from the Institute for Game and Wildlife Research, University of Granada, and University of Cantabria examined 12 ancient bearded vulture nests in southern Spain, where the species vanished 70 to 130 years ago. Among the 2,483 total remains catalogued, researchers identified 226 human-made artifacts including weapons, textiles, and tools dating back to medieval times.popsci

Medieval Treasures in Mountain Caves

The most extraordinary discovery was a complete sandal woven from esparto grass, carbon-dated to between 652 and 696 years old—placing it in the 14th century. Other remarkable finds included a decorated piece of sheep leather approximately 650 years old, a woven basket estimated at 150 years old, and weapons such as a crossbow bolt and wooden lance.nationalgeographic

“Thanks to the solidity of bearded vulture nest structures and their locations in the western Mediterranean, they have acted as natural museums, conserving historical material in good condition,” the researchers wrote. The cliff caves where these territorial raptors build their nests provide ideal preservation conditions with stable temperatures and low humidity.phys

Windows Into Past Ecosystems

Beyond their archaeological significance, the nests offer unprecedented insights into historical ecosystems. The 2,117 bone remains, 86 hooves, and 43 eggshells document the dietary habits and environmental conditions spanning centuries. Lead researcher Antoni Margalida from the Pyrenean Institute of Ecology compared the cave conditions to those of a natural history museum.4vultures

The discoveries could prove crucial for conservation efforts. Toxicological analysis of preserved eggshells may reveal when vultures were exposed to pesticides, while bone varieties could indicate dietary changes over time. This information is vital for understanding how bearded vultures—Europe’s most threatened vulture species with only 309 breeding pairs remaining—went extinct in southern Spain and how to prevent further population declines.nationalgeographic