Games:
http://teacher.scholastic.com/activities/explorer/ecosystems/be_an_explorer/map/foodweb_play.htm
The link above is a game that teaches you how to build a food web, its educating and its fun!
http://www.harcourtschool.com/activity/exploring_ecosystems/index.html
Explore the Ecosystem with this game, learn what's in an ecosystem, and explore living and nonliving parts of 3 different ecosystems!
http://www.scholastic.com/magicschoolbus/games/habitat/index.htm
Match the habitat with the animal with this exciting game!