Extinction of animals

1. Some animals have become extinct. The Dodo and dinosaurs are 
    examples of extinct animals.

           
                                 
                             Dodo                                                                        Dinosaur
2. A species of animals is said to be extinct when it no longer exists 
    in this world.
3. Other animals that have become extinct are as follows. 
                             
                              Aquagga                                                        Tasmanian wolf
4. The animals are extinct because of some factors:
    a) The change in climate or weather
         For example, dinosaur are extinct because of the change in 
         climate on the Earth millions of years ago.
    b) The destruction of their habitat
         The main cause of the extinction of the dodo was the    
         destruction of the forest which cut off the dodo food supply.
    c) Excessive hunting
         The aquagga, Tasmanian wolf and hairy mammoth are 
         examples of animals that are extinct because of human 
         activities such as excessive hunting.