BBC news :
The common hippopotamus (Hippopotamus amphibius) is for the first time included on the Red List of Threatened Species, just published by the World Conservation Union (IUCN).
The unstable situation in Democratic Republic of Congo has led to unregulated hunting, with hippo numbers in the country falling by 95%.
The polar bear (Ursus maritimus) is another new entrant onto the Red List.
The IUCN says the main threat is the reduction in Arctic sea ice, a consequence of climate change. This reduces the bear's ability to find food, and compromises the snow caves where they raise their young.