More species slide to extinction

By Richard Black
Environment Correspondent, BBC News website

The polar bear and hippopotamus are for the first time listed as species threatened with extinction by the world's biodiversity agency.

They are included in the Red List of Threatened Species published by the World Conservation Union (IUCN) which names more than 16,000 at-risk species.

Many sharks, and freshwater fish in Europe and Africa, are newly included.