@natgeo
National GeographicThese worms (Tubifex tubifex) are found in the Sulfur Cave, located between Greece and Albania, alongside gigantic spider webs that are home to more than 110,000 spiders. They live in the sediment of the cave's sulfidic stream, feeding on the biofilm that consists of sulfur-oxidizing microorganisms. Where most caves are characterized by food scarcity, the microorganisms that these worms feed on contribute to the chemosynthesis process that allows the cave's complex ecosystem to thrive. Discover more about this cave's fascinating ecosystem and what researchers are learning about webs inside it at the 🔗 in bio.
On the profile · Jan 2, 2026