National Geographic National Geographic points out unknown and unnamed National Geographic 86 Percent of Earth's Species Still Unknown? National Geogrpahic unknown and unnamed National Geographic points out National Geogrpahic One Canadian study 14 percent of all species on earth 14 percent of all species on earth National Geographic National Geographic unknown and unnamed National Geographic points out National Geographic National Geographic National Geographic National Geographic points out National Geographic points out article unknown and unnamed National Geographic One study published last year 7.77 million animal species National Geographic 14 percent of all species on earth 86 Percent of Earth's Species Still Unknown? National Geographic 86 Percent of Earth's Species Still Unknown? unknown and unnamed age of discovery National Geogrpahic 86% of the earth’s species are still unknown National Geographic points out National Geographic National Geographic 86 Percent of Earth's Species Still Unknown? as quoted in National Geographic 86 Percent of Earth’s Species Still Unknown? Online article National Geogrpahic