Siamang Symphalangus syndactylus Endangered Indonesia, Thailand, Sumatra The siamang is the largest and most vocal of all gibbons, known for their spectacular morning calls that resonate across the forests of Sumatra and Peninsular Malaysia. Their complex vocalisations, amplified by a throat sac, serve as a hallmark of their species and a testament to their social … Continue reading Siamang Symphalangus syndactylus