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US Species at Risk

US Species at Risk: About one-third of U.S. species appear to be at risk due to their rarity or threats from human activities. This figure is based on assessments of more than 20,000 species representing the best known groups of U.S. plants and animals, such as mammals, flowering plants, and butterflies.

Source: Precious Heritage: The Status of Biodiversity in the United States © The Nature Conservancy and NatureServe
US Species at Risk: About one-third of U.S. species appear to be at risk due to their rarity or threats from human activities. This figure is based on assessments of more than 20,000 species representing the best known groups of U.S. plants and animals, such as mammals, flowering plants, and butterflies.

Biological Indicators | Aquatic Biodiversity | Statistical Primer

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