This resource contains thousands of descriptions about individual animal species. Many of these descriptions also includes pictures, movies, audio clips, and more.

A wonderful site with lots of pics and video feeds where you can watch real time aquariums and see fast motion coral movements.

Answer five comprehension check questions about cnidarians and sponges in this interactive quiz.

At this website you are given ten questions to answer and links to three websites where you can find those answers.

Find out about the body plans of some of the most famous of the Cnidarians: the jellyfish.

Find out about the anatomy of a cnidarian on this simplified biology reference page.

Did you know that coral is actually an animal? This site uncovers information on these sea creatures as well as provides links to other coral reef sites.

A learning exercise regarding all types of invertebrates.

Kidzcruz.com provides a list of phylums in the animal Kingdom. Both Latin and English names are included.

This is an advanced level review of the biology of these organisms. The opening photographs are worth seeing!

This California State University Berkeley site offers a brief introduction to the hydrozoa.