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Species richness of birds in North America.

Species richness of birds in North America.
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Description: The values indicate the numbers of different species in a given area. Contour lines show equal numbers of bird species. Note the pronounced latitudinal gradient heading south toward the tropics and the high diversity in California and northern Mexico, regions of considerable topographical variation and habitat diversity.
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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=1420
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