National Wildlife Federation
National Wildlife Federation: Invasive Species
This site explains what invasive species are and how widespread and detrimental their impact is on an ecosystem, on wildlife, and on humans. The methods by which they can travel are listed, and examples of invasive species are given. The...
US Fish and Wildlife Service
U.s. Fish and Wildlife Service: Invasive Species
The U.S. Fish and Wildlife Service presents information on invasive species that invade ecosystems and threaten native species. Examples, legislation, teacher resources, and links to lots of additional resources are included.
Other
Department of Agriculture: National Invasive Species Information Center (Nisic)
A comprehensive guide to national invasive species, including alien plants, animals, and microbes. An invasive species is one that is likely to cause environmental or human harm.
PBS
Pbs Nova: Deep Sea Invasion: The Impact of Invasive Species
Explore the four levels of impact that invasive species can have. Several different invasive species are featured in this overview of the impact an invasive species can have.