A female Orangutan hangs from a tree while eating fruit September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan, Indonesia. The Orangutans live in the national park where they are protected, they get daily feedings of sugared milk and fruit to supplement their diet. (Photo by Paula Bronstein/Getty Images)





A baby Orangutan sits on the back of it's mother while eating fruit September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An orphaned orangutan gets fed milk from a baby bottle by a volunteer September 1, 2001 near Camp II at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An orphaned orangutan gets fed milk from a baby bottle by a volunteer September 1, 2001 near Camp II at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An orphaned orangutan baby rests in it's cage September 1, 2001 at Camp II in the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





A baby Orangutan hangs onto it's mother September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An Orangutan walks around freely September 1, 2001 in Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





A baby Orangutan hangs onto it's mother September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An adult female Orangutan watches her baby play in a nearby tree September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





A baby Orangutan sits on the back of it's mother while eating fruit September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





An adult male Orangutan relaxes September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





A three week old baby Orangutan hangs onto it's mother September 1, 2001 near Camp Leakey at the Tanjung Puting National Park in Kalimantan on the island of Borneo, Indonesia. (Photo by Paula Bronstein/Getty Images)





This picture taken on August 4, 2016 shows two orphaned orangutan babies in a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. Ignoring the shrieks of his rowdy, wrestling classmates, baby orangutan Otan practises swinging alone at his “jungle school” on Borneo island, switching hands and hanging upside down as he builds confidence high above the forest floor. The three-year-old is learning to fend for himself since being found wandering a palm oil plantation, alone and suffering smoke inhalation, at the height of fires last year that razed huge swathes of rainforest in Indonesia's part of Borneo. Sadly, life in the real world has never been more dangerous for these endangered primates. Last month, for the first time in history, Bornean orangutans were declared critically endangered – which is classed as one step away from total extinction. Experts have now warned that these majestic apes could vanish entirely from the island within only 50 years – as the ancient rainforest they’ve inhabited for centuries is chopped down at alarming speed. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows orphaned orangutan babies holding on their animal welfare workers legs as they travel from “jungle school” to their lunch area at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby hanging on a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby playing in a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby hanging in a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows three orphaned orangutan babies hanging in a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby playing in a tree during “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby playing in a tree whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)





This picture taken on August 4, 2016 shows an orphan orangutan baby playing whilst attending “jungle school” at the International Animal Rescue centre outside the city of Ketapang in West Kalimantan. (Photo by Bay Ismoyo/AFP Photo)