Decomposers

are fungi or bacteria
that feed on decaying animals or other matter in order to survive.
http://www.sheppardsoftware.com/content/animals/kidscorner/foodchain/decomposers.htm

http://www.rspb.org.uk/youth/learn/foodchains/decomposers.aspx

http://schools.bcsd.com/fremont/4th_Sci_Life_decomposers.htm

video
http://www.youtube.com/watch?v=GnffYkN1UDk

http://www.watchknowlearn.org/Category.aspx?CategoryID=6730

http://www.youtube.com/watch?v=ShGF5mkFbzU

Interactive

http://www.sheppardsoftware.com/content/animals/kidscorner/games/producersconsumersgame.htm

http://www.recycleworks.org/kids/decomposers.html

http://www.nhptv.org/natureworks/quiz11.htm