Use any of the following sites to learn more about food chains.
www.youtube.com/watch?v=0ZOvqYypOuo
http://www.sheppardsoftware.com/content/animals/kidscorner/foodchain/foodchain.htm
http://www.sheppardsoftware.com/content/animals/kidscorner/games/foodchaingame.htm
www.youtube.com/watch?v=-YwW-iWxLr4
http://www.sciencekids.co.nz/gamesactivities/foodchains.html