Credit: WCS Indonesia/Cani Marcus
Singkil Wildlife Reserve in Aceh Province in Indonesia has the highest density of Sumatran orangutans, a critically endangered great ape species, only found in the northern part of Sumatra. They use twigs and branches to collect insects and worms inside tree trunks to adapt their lifestyle with the swampy habitat there. The Rawa Singkil Wildlife Reserve is a habitat for Critically Endangered and protected Sumatran orangutans, Sumatran tigers, and other species such as sun bears, agile gibbons, saltwater crocodiles, and some water birds.