Pick out the world’s rarest monkey.

The world’s rarest monkey is the Hainan gibbon. It is a small, long-tailed monkey that is found only on the island of Hainan in China. The Hainan gibbon is critically endangered, with only about 20 individuals left in the wild. The main threats to the Hainan gibbon are habitat loss and hunting.

The other options are:

• Baboon: Baboons are large, social monkeys that are found in Africa and Asia. They are not endangered.
• Common marmoset: Common marmosets are small, New World monkeys that are found in South America. They are not endangered.
• Golden langur: Golden langurs are medium-sized, Old World monkeys that are found in Southeast Asia. They are not endangered.

The Hainan gibbon is a beautiful and unique monkey that is facing extinction. It is important to protect this species and its habitat so that it can survive for future generations.