The term 'Sumatran Swingers' refers to a species of primates known as orangutans, which are native to the island of Sumatra in Indonesia. Orangutans are the only great apes found in Asia and are known for their distinctive red-brown fur and long arms. They are also highly intelligent and have been observed using tools and engaging in complex social behaviors. As their name suggests, orangutans are also known for their swinging movements, which they use to travel through the trees of their forest habitats.