Orangutan

The long period taken to reach sexual maturity, the long interbirth periods (once every 5-8 years) and the fact that orangutans normally give birth to just a single young, means that orangutans have an extremely slow reproductive rate. This makes orangutan populations highly vulnerable to excessive mortality.
Orang Utans are highly intelligent with an ability to reason and think. This large, gentle red ape is one of our closest living relatives, sharing 97% of our DNA. They are the only strictly arboreal (tree living) primate.