If the habitat changes, it may no longer be suitable for the animals and plants that live there. Climate change is making some habitats warmer, and so many animal species are moving to cooler areas. However some species are not able to move and the populations are getting smaller. Scientists think that 10% of species may become extinct because of these changes. Other habitats have been cleared to make them into farm land. In Australia for example, 80% of the eucalypt forests have been cleared for farming over the last 210 years. This is threatening the survival of forest animals such as the koala.