Grumble Rumble - Toddler Story Books Author:Siobhan Dodds Little Roo is not hungry. He doesn't want Kangaflakes or honey on toast for breakfast. He'd much rather play outside. But then he hears a very loud Grumble-Rumble! Little Roo tells his friends but they are not afraid. When Roo hears it again mummy explains that it is his tummy that is hungry.