Pete Oxford / Sand balls made by Sand Bubbler Crab (Scopimera inflata) North Stradbroke Island off Queensland coast, Australia

Juergen Freund / As the tide retreats thousands of little Sand Bubbler Crabs {Scopimera inflata} emerge from their homes to feed off microscopic material between the sand grains, cleaning the sand as they go. Queensla...

Juergen Freund / Sand bubbles created by little Sand Bubbler Crabs {Scopimera inflata} as they feed off microscopic material between the sand grains, Queensland, Australia

Mark Taylor / Balls of sand created by feeding Sand-bubble crabs {Scopimera sp} Queensland,