I'm writing a legend on why turtles have shells .. What should I write about ???

Read through several of these search results, and then use your imagination to come up with a legend.

http://www.google.com/search?q=why+turtles+have+shells&oq=why+turtles+have+shells&aqs=chrome..69i57j0l5.4533j0j7&sourceid=chrome&es_sm=119&ie=UTF-8