It looks like stone. Oligosoma oliveri is the living stone of Great Barrier Island. At sixteen to twenty centimetres in length, it is a medium-large skink. Robust and powerful. Dark brown to greyish-brown colouration features pale marbled markings. Belly is pale cream. Eyes are dark and watchful. It looks like the rocks it lives among. Grey, textured, solid. A skink of the coastal rocks. Found only on Great Barrier Island and nearby islands, in coastal forests, scrublands, and rocky shorelines. A diurnal species, active during the day. It basks on sun-warmed rocks and logs, soaking up heat that fuels its hunting. The island stands in the Hauraki Gulf, exposed to wind and waves. This skink has turned that exposure into a way of life. Tolerates salt spray and windy conditions. Viviparous, giving birth to live young. Females produce two to four offspring each year. A slow reproductive rate that makes species vulnerable to population decline. Young are born in late summer and are miniature versions of adults. Independent from birth. On an island with few native predators, this slow rate was once sustainable. Then rats arrived. Threatened by habitat loss and predation. Restricted range makes it vulnerable to localised threats. Population is declining. Great Barrier Island is remote, but even there, development and introduced predators have taken a toll. Land development and vegetation clearance are primary threats. Introduced rats, cats, and hedgehogs prey on adults and young. Climate change affects coastal habitats. To see a Marbled Skink is to see a lizard that exists nowhere else on Earth. A creature of the island rocks. A survivor of the Hauraki Gulf. Its marbled pattern is a reminder of stone and sea. Of ancient geology of Aotea. The island stands in the gulf. As long as it stands, there is hope for this marbled survivor.