Sharks

Ultimate Guide to Sharks in the Deep: http://videos.howstuffworks.com/discovery/36698-ultimate-guide-to-sharks-deep-water-sharks-video.htm

Ultimate Guide to Sharks in the Shallow:

http://videos.howstuffworks.com/discovery/36708-ultimate-guide-to-sharks-sharks-in-the-shallows-video.htm

Ultimate Guide to the Whale Shark: http://videos.howstuffworks.com/discovery/36711-ultimate-guide-to-sharks-whale-shark-video.htm

Island of athe Sharks (Diagram): http://www.pbs.org/wgbh/nova/sharks/world/diagram.html

Hammerhead Sharks: http://www.youtube.com/watch?v=Ekvr_mUxVzw