Follow the lives of orphaned orangutan babies as they are brought to the world's oldest orangutan sanctuary in Borneo. Toddlers are wheel-barrowed in for lessons in life.

Three-year-old orphan, Bidu Bidu, makes a pal on his first day at Forest School. But when his climbing buddy tragically dies, can Bidu pull through on his own? Sepilok’s only permanent resident, eleven-year-old Nonong, is piling on the pounds, how will she cope with a carb-free diet? And Primatologist, James Robins, tracks down one of the Centre’s rehabilitated females to make sure she’s coping in the wild.

The orphaned orangutan Peanut is one of the newest and youngest arrivals at the sanctuary. He has made friends with Beryl, but he is not feeling very well.

It’s a family crisis when the team discover former Sepilok resident and regular visitor, Ann, is pregnant. This should be great news, but Ann’s foster daughter, Mui Mui, is distraught; Trouble-some teenager Ceria is also back paying a visit but this time he’s in trouble, he’s the victim of a dog attack; And Sue braves the world’s smelliest fruit to put the babies’ observation and learning skills to the test.

Five-year-old Gellison is the laziest baby in nursery and a bully to boot. But will his attitude be adjusted for him when he’s forced to play with the big boys? It’s an emergency trip to the human clinic when star Graduate Poogle is struck down with a mystery swelling. And adolescent male, Mico, also hits the road when he’s relocated to a protected forest reserve. But how will he cope in the wild?

It's feeding time for the residents of Sepilok, and the orangutans are well cared for. However, they need to learn to find food themselves, and this can be tricky.