Roo on the Rock

 is the eighteenth book in the Animal Ark book series, written by Lucy Daniels, which was first released in 1996.

Summary
Six months in the Australian outback is a dream come true for Mandy. Moonbeam is an orphaned baby kangeroo.

He's too young to survive on his own - he'll have to be sent to a zoo. But Mandy thinks wild animals should stay in the wild - she's not going to let this roo spend his life in captivity! Can Mandy help Moonbeam to escape?