Threatened and endangered species
Summary:
The main reason that makes the world change rapidly are: increase of human population, colonisation, poverty, human greed, pollution and disease. The extinction of animal is a natural process, but human has greatly speed up of process which makes the animal disappear. There are two groups of endanger species such as critically endangered and simply endangered. The simply endangered are the orangutan, the black rhinoceros and the Sumatran tiger. The critically endangered are the Asiatic lion and the Pygmy hippopotamus.