All of the aforementioned species are in danger or critically in danger of extinction and only one of them is currently receiving conservation help. Possibly due to their unusual looks, they are overlooked by TV crews and fundraising calendars and so nobody even knows they are in trouble. The Pygmy three-toed sloth, for example, lives in a very specific part of an island that has been separated from Panama for 9,000 years. This island is potentially threatened by tourism development and a lax regulation of fishermen poaching, causing the safe habitat where they live to be limited. Most people know of sloth species, but for the reasons that they are slow and live hanging upside down, concern for their numbers is probably a less common thought. The Sumatran rhinoceros is a smaller version of its African cousins, but it has two horns and its endangered status is widely unknown. The African wild ass is the ancestor of the modern day donkey and only a few hundred of them now exist, but would perhaps be dismissed as only a donkey. The Ethiopian water mouse, which is the only mouse adapted for swimming, is feared to already be extinct. If this is the case, few people would have known of its plight in the first place.