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The park's stategic geographic location and varied habitats are largely responsible for its high faunal diversity. More than 140 species of vertebrates, including at least 46 mammals, 100 birds, 10 amphibians, 20 fish and 3 reptiles pass through or make their permanent home within the park. The many species of invertebrates have yet to be inventoried. 
The park has a high number of resident and migratory birds due to its diversity of habitats and its location on the Pacific flyway.
Lewis and Clark NHP river, streams and sloughs are home to a variety of fish including federally listed salmon.
The park's extensive and diverse wetlands support a relatively high number of amphibians.
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Last updated: September 13, 2020