Every evening, the caves in Mulu National Park begin to squeak and rustle, as close to 3 million bats prepare for their nightly hunt. The enormous colony, home to at least 12 species of bats, emerges in undulating ribbons, traveling in groups to protect themselves from predators. 

This nightly bat exodus, which occurs most early evenings between 5:30 p.m. and 6:30 p.m., is one of the most popular attractions in the park, located in Sarawak, Malaysian Borneo. In the above video by Urzala Productions, the bat colony rises from its caves in spectacular formations and disappears into the forest to search for food. It's a spectacular ritual, captured in silhouette against a cloudy evening sky. According to the Mulu National Park website, the bats travel up to about 62 miles a night, before returning home in the early morning. Enjoy the video above, and check out the Mulu National Park website to learn more about these creatures.

[h/t: Gizmodo]

Banner image credit: URZALA prod., Youtube