For Animal Studies:

National Geographic for Kids - Animals
http://kids.nationalgeographic.com/Animals/

Animal page on National Geographic (lists mammals and reptiles):
http://animals.nationalgeographic.com

ENature - look for mammal and reptile section
http://www.enature.com/home

Enchanted Learning: Animals (mammals and reptiles included)
http://www.enchantedlearning.com/coloring/

* Also, go to the Library Resources Page and go to Elementary Britannica - search there, as well! You have to link from the Library page or it won't recognize our log in.