RIASSUNTO
ACCORDING TO THE International Union for the Conservation of Nature (IUCN) 67,222 species of animals, of which 5,674 are mammals, are on its ‘red list’ of endangered species — fish and birds are the most heavily hit. Of these, 1,337 (109 mammals) are already either extinct, possibly extinct or extinct in the wild, and a further 13,267 (1,204 mammals) are critically endangered, endangered or vulnerable.