Bearded Vulture Nests Hold Trove Of Centuries-Old Artifacts

Key Takeaways Copied to clipboard!

• Scientists studying 12 preserved bearded vulture nests discovered hundreds of centuries-old human artifacts, including a woven sandal potentially over 700 years old, offering a glimpse into both vulture culture and the lives of the people who lived nearby.  Copied to clipboard!
• Bearded vultures, whose diet is 70-80% bone, incorporate materials like human artifacts into their massive, multi-century-old nests primarily for thermoregulation to keep their eggs warm.  Copied to clipboard!
• The recovered artifacts, such as grass shoes, baskets, and a sheep leather mask, provide archaeologists with new avenues to research ancient environmental conditions, local flora, and human crafting techniques through time.  Copied to clipboard!

Segments Expand All Collapse All

Vulture Artifact Discovery Surprise

Copied to clipboard!

(00:01:34)

• Key Takeaway: The study author was completely surprised to find ancient human artifacts, like an 800-year-old shoe, in bearded vulture nests.
• Summary: The initial expectation when investigating bearded vulture nests was finding only bones and sticks, the main nest components. Finding an 800-year-old shoe was entirely unexpected by the research team. This discovery prompted the investigation into the nests as repositories of human history.

Bearded Vulture Appearance and Nests

Copied to clipboard!

(00:03:42)

• Key Takeaway: Bearded vultures are majestic birds with wingspans up to 2.4 meters, and their nests can be massive structures accumulated over centuries, reaching depths of four meters.
• Summary: The bird is described as majestic, featuring a beautiful orange color contrasting with black wings. Their nests are massive, sometimes measuring 1.5 meters wide and accumulating material over centuries. Some nests were found to be four meters deep, indicating long-term, generational use.

Dating Nests and Ancient Finds

Copied to clipboard!

(00:05:35)

• Key Takeaway: Carbon-14 dating revealed that some artifacts, specifically grass shoes found in the nests, date back nearly 800 years to the 13th century.
• Summary: Carbon-14 dating was necessary to determine the age of the materials within the nests. The most surprising discovery was shoes made of grass dating back almost 800 years. Other finds included an arrow with a metal point and a sheep leather mask painted with red lines.

Artifacts Informing Past Lives

Copied to clipboard!

(00:07:07)

• Key Takeaway: Nest materials provide diverse information about the past environment, including local tree species, animal populations, and potential environmental contaminants like lead.
• Summary: The recovered materials offer information on the types of trees present in the environment used by the vultures for nest building. Eggshell analysis is planned to check for contaminants, such as lead used by hunters at that time. The variety of shoes allows for future investigation into different human crafting techniques over time.

Reason for Artifact Collection

Copied to clipboard!

(00:07:59)

• Key Takeaway: Bearded vultures likely incorporate thick, stable human artifacts like shoes into their nests to help thermoregulate the temperature for their eggs.
• Summary: The birds likely view abandoned, thick, and stable items like shoes as excellent material for insulation. This material helps maintain the necessary temperature within the nest when the bird is incubating eggs. One dated shoe fragment was from the 13th century, while a grass basket fragment was more recent, from the 18th century.

Bearded Vulture Diet and Digestion

Copied to clipboard!

(00:09:33)

• Key Takeaway: Bearded vultures subsist primarily on bones (70-80% of their diet) and employ a unique technique of dropping bones from high altitudes onto stones to break them into swallowable pieces.
• Summary: This bird is unique as it is the last in the trophic chain, often waiting for other carnivores to finish consuming flesh before selecting bones. They prefer the distal parts of legs due to higher grease content, typically selecting herbivore skeletons like sheep or deer. Their extremely low stomach pH allows them to digest bones, resulting in chalky white feces.

Future Research Potential

Copied to clipboard!

(00:12:38)

• Key Takeaway: The nests are considered ’natural museums’ that open new research lines focused on dating materials and investigating the evolution of vegetable crafting techniques.
• Summary: The artifacts recovered open a new research path to investigate different vegetable materials and grasses used in making items like shoes and baskets. Researchers plan to date all recovered materials to establish a timeline of nest occupation. The study author anticipates more great surprises as further samples are analyzed.