Giant Galapagos tortoises used to be a symbol In for from of out over to up endangered animals. In for from of out over to up the 1960s, there were just 15 In for from of out over to up the animals In for from of out over to up existence. They were dying In for from of out over to up because wild goats were eating their food and damaging their habitat. This caused conservationists to take action to help them. Forty years later, the tortoises are doing well. There are In for from of out over to up 1,000 In for from of out over to up them living and breeding In for from of out over to up the wild. Scientists say it is a conservation success story. Conservationist James Gibb said: "What we basically found In for from of out over to up time is that about half In for from of out over to up the tortoises that were released have survived." Mr Gibbs added: "That’s actually pretty amazing." Gibbs said the tortoises can now survive without human help. Giant tortoises used to live all In for from of out over to up the world. People hunted them and destroyed their habitat, so they almost became extinct. Giant tortoise numbers fell In for from of out over to up over 250,000 In for from of out over to up the 16th century to just a few thousand In for from of out over to up the 1970s. Giant tortoises can weigh In for from of out over to up to 250 kg and can live In for from of out over to up the wild for In for from of out over to up 100 years. One tortoise lived In for from of out over to up captivity In for from of out over to up more than 170 years. Wikipedia says: "Tortoises also live very uncomplicated lives, and can nap In for from of out over to up to 16 hours a day." Mr Gibbs said the conservation story In for from of out over to up the Galapagos Islands would continue. Next year, a small island that lost all In for from of out over to up its tortoises a few years ago will get 200 tortoises. Gibbs is looking forward In for from of out over to up "another success".