Vertebrate species typically have ranges {biogeography} smaller than large USA states. Common birds, such as cowbirds, grackles, and cardinals, have larger ranges. Only species with large ranges are not rare. Most vertebrate species are rare.
State-size regions can have few, medium, or many species, depending on climate and resources. Tropical areas have 100 times more species than arctic areas. Areas with many species have species with large ranges. Areas with few species have species with small ranges.
Biological Sciences>Ecology>Ecosystem
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Date Modified: 2022.0224