- Peter Coates, American Perceptions of Immigrant and Invasive Species: Strangers on the Land (Berkeley: University of California Press, 2006).
- Edward Hicks, Peaceable Kingdom, c. 1834.
- T. S. Palmer, "The Danger of Introducing Noxious Animals and Birds," Forest and Stream, June 1899, 443-444.
America's wildlife looks different than it did before Columbus: Newcomers to North America introduced many plants and animals. Some introductions were accidental, but others were made to "improve" the New World.
In each pair of species, one is native to America and one was introduced. Select the introduced species: