Why do some animals become extinct?
Some creatures die out, or become extinct, while others flourish. This is part of the process of evolution. Successful species move into new areas, or start eating new food, or adapt to a change in climate, and so evolve into new forms. The extinctions make space for new species to emerge. Human activities such as forest clearance, building and road-making, which are not part of a natural process, are now also causing extinctions, too quickly for evolution to fill the gaps. We are now losing thousands of species every day, and they are not being replaced.