Did siamangs inherit their all-black fur from a common ancestor?

💡 The Answer

• Siamangs are the only gibbon species with entirely black fur as adults.
• This coat color may have evolved for thermoregulation in the rainforest understory.
• Unlike other gibbons, siamangs lack white markings, which aid camouflage.
• Their black fur also reduces visibility during low-light dawn and dusk activity.