Create your own food chain. http://www.vtaide.com/png/foodchains.htm
Calculate your ecological footprint. http://www.royalsaskmuseum.ca/gallery/life_sciences/footprint_mx_2005.swf
Canadian endangered species. http://www.cbin.ec.gc.ca/index.cfm?lang=e
US endangered species. http://www.endangeredspecie.com/
Build your own food web. http://www.harcourtschool.com/activity/food/food_menu.html
Food webs vs. chains. http://www.sciencebob.com/lab/web-chainprint.html