An unique ecosystem
- When Earth's climate changed 5.5 million years ago, the area went from being tropical to temperate. The only animals that survived were those living in warm caves underground. Movile Cave, is one of Earth's most unusual ecosystems, populated with invertebrates that have adapted -- through a process called troglomorphy -- to their underground prison. They have done this by losing pigmentation, learning to navigate blind, and surviving on bacteria and fungi that derive energy from the sulfide hot springs beneath the cave.