Penguins
Penguin World - http://www.penguinworld.com/
KidZone - Penguins - http://www.kidzone.ws/animals/penguins/index.htm
Penguin Science - http://www.penguinscience.com/classroom_home.php
Pete and Barbara's Penguin Pages - http://www.penguinpages.org/
Penguins Of the World - http://www.penguins.cl/penguins-region.htm
Enchanted Learning - Penguins (only has a few specific penguins) - http://www.enchantedlearning.com/themes/penguins.shtml