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Gobiids use their mouths to dig into the sea bottom, removing dead coral-fragments, rubble, and benthic algae in order to build their burrows. Gobiids maintain their burrows by fanning away sand inside the burrows. Furthermore, gobies use coral rubble to block burrow entrance. A single goby can carry as many as nine pieces of coral rubble per minute. Gobiids also build a 6-13 cm high mound over the entrance of their spawning burrow. The mound lets

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