Gibbons Sing Loudly at California Sanctuary, Raising Awareness for Endangered Species

LOS ANGELES -- In between morning feedings, the gibbons begin to sing — loudly. Ranging from the sound of emergency sirens and birds screeching to low grunts and guttural hoots, their vocalizations reverberate from a sanctuary in the hot, dry hills of the Santa Clarita Valley, north of Los Angeles. [...] When he passed away, I just felt that he’s around and helping us keep this center going,” she said.