According to the theory of evolution, some animal species become extinct because they are less successful than other species that gradually replace them.
These so-called ‘failed’ animals are also unable to adapt to changing circumstances. Humans have accelerated their extinction by changing the environment so rapidly that animals do not have time to adapt. For example, the destruction of Indonesian rainforests has left nowhere for the orangutan to live. It would take millions of years for the animal to evolve into a ground-living creature. Hunting is the reason for the reduced numbers and probable extinction of animals such as the tiger, the blue whale and the giant panda.
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