Food and Agricultural Organization of the United Nations
Alien Species Harmful to North American Forests
This informative site examines when do alien species are become harmful to North American forests and why is such a large issue now. International biodiversity agreements and programs are discussed as well.
PBS
Nova: Matching Aliens With Impacts
One of the major causes of species extinction is the introduction of alien species. Information about ten different invasive species is presented. Find out how well you know the information by matching alien species with the effects...