Steven David Miller / Sand bubble patterns created by Sand bubbler crabs (Scopimera inflata), Cape Hillsborough National Park, Queensland, Australia. September.

Steven David Miller / Sand bubble patterns created by Sand bubbler crabs (Scopimera inflata), Cape Hillsborough National Park, Queensland, Australia. September.

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

Chris Mattison / Burrows of Sand-bubbler crab (Scopimera inflata), Mission Beach, Queensland, Australia