environmental science

What are the causes of wildlife extinction?

I know that humans are the main reason but i am looking on more in the deforestation as a main cause but not sure how to explain it.needing to be able to explain this to a ten year old fifth grader. any suggestions.
he has to have a poster made up showing the estimations of the current impact of deforestation on world. I have found some pictures of animals and plants that are extinct but how would do you figure out the impact they had on the world?

http://www.awionline.org/pubs/Quarterly/spring2001/wildlife_extinction.htm

http://www.google.com/search?hl=en&lr=&safe=active&as_qdr=all&q=deforestation+%22wildlife+extinction%22+

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asked by larry
  1. you can figure out the impact they had on the world by looking it up online or finding it in encyclopedias/your science textbook/or if you have a freind and your in the same class or even learning the same thing you can call them up and ask.

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    posted by leonard

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