Preview Z7A7448.jpg

Millions of bats are leaving the Deer Cave at nightfall, Mulu National Park

File: Z7A7448.jpg

Title: Millions of bats are leaving the Deer Cave at nightfall, Mulu National Park

Millions of bats are leaving the Deer Cave after sunset, Mulu National Park

Credit: Gerhard Hüdepohl / atacamaphoto