A carnivorous mammal, the giant otter is native to South America, mostly living in and along the Amazon river. They are the largest of any otter in the world, measuring up to 1.8m in length. They primarily feed on fish but are also known to prey on caiman, piranhas and even anacondas. They are threatened by habitat destruction due to infrastructure such as hydroelectric dams as well as being hunted for their skin. They are also harmed by river contamination resulting from mining and agriculture.