Medieval Artifacts Uncovered in Vulture Nests Across Southern Spain

Vultures are not known for their depository conservation skills, but possibly that ought to change.

Scientists person discovered an improbable grounds of quality past deep wrong layers of bony debris near by generations of bearded vultures and their bone-crunching babies, cautiously preserved by the birds crossed the centuries.

There are lone 309 breeding pairs of bearded vultures (Gypaetus barbatus) remaining successful Europe. But backmost successful the 19th century, they inhabited hollows successful cliff faces crossed the continent, including the Iberian Peninsula.

Related: Shift successful India's Vulture Population Linked to Half a Million Human Deaths

All that remains of these now-extinct lineages successful confederate Spain are their nest sites, oregon 'eyries', immoderate of which person sat unattended for 130 years.

Cliff-front spot is hard to travel by, truthful galore raptors support intergenerational nest sites 'in the family' crossed decades and adjacent centuries.

One of the past bearded vulture nests, present empty. (Sergio Couto/Margalida et al., Ecology, 2025)

The cliff caves favored by bearded vultures are peculiarly valuable. The sheltered, cooler microclimate of the caves provides perfect conditions for keeping accumulated bony remains caller arsenic chicks larn to munch distant astatine them.

But it's not conscionable their determination that vultures prize: wrong this premier existent estate, families of vultures hoard layers of nesting material, collected from their surrounds crossed the years.

The caves bash specified a bully occupation of preserving the nesting worldly that scientists person recognized treasures of adjacent value to our ain taxon among the layers – and an impressively well-preserved grounds of section flora and fauna, too.

Ecologist Antoni Margalida from Spain's Institute for Game and Wildlife Research regularly visits nests maintained by the surviving bearded vultures, and has often noticed pieces of cloth, string, and different human-made materials placed crossed the furniture to assistance insulate processing eggs.

This led him to fishy that vultures whitethorn person been collecting the flotsam and jetsam of our ain taxon for rather a agelong time. He led a squad to sojourn 12 abandoned bearded vulture nests successful confederate Spain and comb done these once-cherished household archives, furniture by layer.

"Thanks to the solidity of bearded vulture nest structures and their locations successful the occidental Mediterranean… they person acted arsenic earthy museums, conserving humanities worldly successful bully condition," Margalida and squad report.

The nests chiefly comprised the bones of hoofed animals, providing a elaborate grounds of the vultures' meals – and, by proxy, the animals that person inhabited the country – since medieval times.

"This basal humanities information and that collected connected feeding habits and nest-site enactment supply prime accusation connected the situation characteristics and nutrient species' enactment of this taxon respective centuries ago," the squad explains.

Intermingled with the layers of bones were fragments of eggshells near down by generations of vulture broods. Females lone laic 1 oregon 2 eggs each year, truthful these fragments whitethorn let for toxicology studies that lend to conservation efforts by providing grounds of historical pesticide loads.

But the astir breathtaking and antithetic discoveries were of quality origin: respective past sandals, made from a assortment of grasses and twigs – the oldest of which, a implicit sandal made from esparto writer cord, was made 674 years agone successful the precocious 14th century.

Within the vultures' nests, scientists uncovered a hoard of quality history. (Sergio Couto/Margalida et al., Ecology, 2025)

Along with a 650-year-old decorated portion of sheep leather recovered successful the aforesaid nest, c isotopes confirmed that vultures established this peculiar nest 5 centuries earlier than different nearby.

The squad besides recovered a 151-year-old handbasket fragment; a crossbow bolt and its woody lance; portion of a slingshot made from braided esparto grass; and a scope of different grounds of humanities culture.

"All of these remains attest to the usage of works fibers successful the Mediterranean portion of the Iberian Peninsula to marque a wide assortment of artifacts from the Epipaleolithic period, astir 12,000 years ago," the squad writes.

"Bearded vultures arsenic accumulators of bony and quality artifacts successful bluish Iberian caves person provided insights into the prehistoric quality groups who besides lived there… thus, the bearded vulture could beryllium regarded arsenic a bioindicator of exceptional worth for semipermanent ecosystem monitoring and interdisciplinary research."

Vultures melt bones with their gnarly tummy acid, clean up our environment, protect america from disease, and sphere our past on with their own. It's astir clip we showed them immoderate respect.

This probe was published successful Ecology.