These are the People of the Forest - the Orangutan, natives of Indonesia and Malaysia, inhabiting the rainforests of Borneo and Sumatra. Their long arms and short legs, and their hands and feet are adapted for agile life in the trees. The most solitary of the great apes, they nonetheless have an acute social intelligence, with distinctive group cultures.
Their intelligence is shown by their sophisticated use of tools. They are toolmakers, these people of the trees. If aliens from another world ever came to the planet earth, they would recognise this intelligence. But another aspect of their intelligence would also be evident. They communicate abstract concepts. This is particularly so when mothers are teaching their young. Not only do they inform the young about the presence of danger, but they will also teach them that something that has happened was dangerous. This, of course, is what we do with our children.
Yet, they are threatened by you and me, the people of the concrete jungles. Human activity, our insatiable appetite for land and plantation is the greatest threat to these people of the forest - poaching, habitat destruction, palm oil production, and illegal pet trade have severely reduced their numbers.
We spend billions of dollars looking for intelligence on other planets, somewhere out there in the universe, yet we spend so little on recognising and protecting it here on earth. Intelligence is a precious thing. Let us not use our intelligence to destroy it but to nurture it. Intelligence is nature.
Let's not blow our own trumpet so much that we drown out that of other species. Orangutans use tools to make sound, or at least to amplify the sounds they make. This is one way they can enhance their communication. The music they make is cultural, and different groups may use different tools to make sounds.
The greatest threat to the Orangutan is our activity. A major factor has been the conversion of vast areas of tropical forest to palm oil plantations in response to international demand. The burning and clearing of forests are killing the people of the jungle.
Ray Noble is a chartered biologist and Fellow of the Royal Society of Biology.