 Several species build up mounds of coral pieces either to protect the entrance to their burrows, as in tilefishes and gobies of the genus Valenciennea, or to protect the patch of sand in which they will bury themselves for the night, as in the Jordan's tuskfish "Choerodon jordani"  and the rockmover wrasse "Novaculichthys taeniourus".Male sticklebacks are well known for their habit of building an enclosed nest made of pieces of vegetation glued together with secretions from their kidneys.Some of them adorn the entrance of the nest with unusually colored algae or even shiny tinfoil experimentally introduced in the environment.