#5. Orangutans: Orangutans share nearly 97% of their DNA with us and are some of the most intelligent animals on Earth. These frighteningly human-like animals numbers have been thinning out. There are two species of orangutan, the Bornean and the Sumatran. The WWF estimates that are only about 45,000 – 69,000 Bornean orangutans and about 7,500 Sumatran orangutans remaining in the world.