EPA Wetlands - http://water.epa.gov/type/wetlands/
Definition and protections for wetlands.

Animal Diversity Web - http://animaldiversity.ummz.umich.edu/index.html
Collection of information and pictures about animals. Search for individual species to find information and images.

eNature.com - http://www.enature.com/
Information about animals and plants of the wetlands.

Wetlands - http://edtech.kennesaw.edu/web/wetlands.html
Many resources on wetlands are available on this page.