The world's largest green turtle colony is almost twice as big as initially thought, say Australian scientists. According to a Reuters report, the team analysed drone surveys of the animals, and found 64,000 green turtles waiting to lay eggs on the Raine Island, located on the outer edge of the Great Barrier Reef. This number was significantly more than earlier thought. The numbers had largely been underestimated, according to research partners at the Biopixel Oceans Foundation. The species has been listed as endangered, and this comes as positive news for conservationists.