For nine-month-old koala joey Cass, a day at koala school means learning what leaves to eat — and which ones to avoid. The keepers at Featherdale Sydney Wildlife Park have become surrogate mums, teaching her all about life as a koala. The adorable joey isn’t a typical orphan, in fact she was born as part of the ­wildlife park’s breeding program. She even spent the first few months of life in her mum’s pouch. But unfortunately Cass’s mum didn’t take well to parenthood.