Tales from the Bush Mob.
 
Gecko and Thorny Devil admire Bungarra and they want to find a special birthday present for their friend. When they hear about the sweetest egg of all, they hatch a plan to surprise Bungarra with this very special gift. Little do they know they will be lured into doing the wrong thing and getting into trouble with the Bush Mob! Fortunately, the Bush Mob comes up with a rescue plan and Gecko and Thorny Devil learn a valuable lesson.
 
The Sweetest Egg of All is the third book in the Tales from the Bush Mob series following on from Willy-Willy Wagtail and The Emu Who Ran Through the Sky.