The following books and websites contain additional information, activities, and enrichment options.

Amphibians

Rod Theodorou, Heinemann, 1999

Fish

Rod Theodorou, Heinemann, 1999

Horseshoe Crabs and Shorebirds: The Story of a Food Web

Victoria Crenson, Cavendish, 2003

River

Debby Atwell, Houghton Mifflin, 2004

Sea Grant Ocean Sciences Education Center

http://www.vims.edu/bridge/

All About Turtles

http://octopus.gma.org/turtles/

For additional websites, see the Best of the Net feature at www.eduplace.com/science and sites recommended by the National Science Teachers Association at www2.nsta.org/sciencesites/