The pictures come from staff at International Animal Rescue at their rehabilitation centre in Ketapang, Borneo.
These kids grew up in captivity before they were rescued.
At the school, they'll learn to climb, play, and fend for themselves before they get released back into the wild.
Lis Key, a spokesman for International Animal Rescue, toldMailOnline: "Human toddlers often protest at walking any great distance – and orangutans are no different."
"Inevitably this does involve the occasional thrills and spills. Some individuals sit quietly and enjoy the ride, others opt to bail out early, particularly on the return journey if they're not too keen on going home to bed."