In this new documentary production you will meet one of the breeding colonies of the largest mouse-tailed bats in Argentina. A tunnel of just 150 meters serves as a refuge to one million female bats with their young. The size of this colony is such that the daily departure of the animals to feed is detected by radar tens of kilometers away. Far from posing a threat, these colonies provide environmental services of great value for society. It is a realization of Timbó films for Fundación Biodiversidad Argentina, for its cycle "Biodiversity in Action”. To watch other documentaries, visit our YouTube channel and subscribe to receive notifications.