Every morning, as dawn breaks over the dry hills north of Los Angeles, a chorus of sirens, deep hoots and high-pitched calls echoes across the Santa Clarita Valley. The sounds come from the Gibbon Conservation Center, a sanctuary that has spent half a century protecting some of the world’s most endangered primates.

Over the past 50 years, the Gibbon Conservation Center has become a globally recognized institution dedicated to the care and well-being of gibbons.

The Gibbon Conservation Center, which has been running since 1976, is open for guided tours on the weekends