This page goes along with animal diversity content. It focuses in on invertebrates covering content about sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, arthropods, and echinoderms.
Click on the following links, in order, to extend knowledge of invertebrates and finish up by exploring the virtual exhibits of the Smithsonian museum.
1. Fact article about invertebrate groups: http://nationalzoo.si.edu/Animals/Invertebrates/Facts/default.cfm
2. Read more in depth about Arthropods (insects): http://nationalzoo.si.edu/Animals/Invertebrates/Facts/insects/
3. Read more about Mollusks (Cephalopod)http://ocean.si.edu/blog/so-you-think-youre-smarter-cephalopod
Oceans Virtual Field Trip at the Smithsonian Museum: http://www.mnh.si.edu/panoramas/flashVersion/index.html