Telegraph: * Of the 5,487 mammals on Earth 1,141 are known to be facing extinction. * The survival of one in four of the world’s land mammal species and one in three marine mammal species is threatened by extinction. * There are now 1,983 species of amphibians (32 per cent) either threatened or extinct. * A representative sample of reptiles shows that over one in five face extinction. * The main threat to land animals is loss of habitat, dispersal of species and …