Enchanted Learning
www.enchantedlearning.com
Fact Monster
http://www.factmonster.com/
Wordsmyth
http://www.wordsmyth.net/
Animals
http://animaldiversity.ummz.umich.edu
http://animal.discovery.com/guides/atoz/atoz.html
http://www.kidsites.com/sites-edu/animals.htm