5 invasive species now in retreat

A cotton boll weevil is shown in this undated U.S. Department of Agriculture photo. The tiny pest that has caused billions of dollars in damage to cotton fields nationwide has nearly been eradicated.
U.S. Department of Agriculture/AP/File

Invasive species are ones that don't naturally occur in an area and may have detrimental effects.  Here are some eradication success stories.

Sources: Global Invasive Species Database, International Union for Conservation of Nature, National Cotton Council, US Dept. of Agriculture

1. Rinderpest virus

Described by the Global Invasive Species Database as a micro-organism, rinderpest had decimated cattle, buffalo, yak, and other livestock. The virus was declared eradicated by United Nations researchers in October, 2010, after a 23-year battle.

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