Herd of bison in Yellowstone National Park

North American wildlife

During its history, North America has been in contact with South America and Eurasia, and been colonised by animals and plants from both landmasses. Some of these have gone on to evolve into new species in their new home. North America also had native creatures that evolved in situ and spread across the world later, such as the horse family and reindeer. Those mountain ranges that run north to south, such as the Rockies and the Sierra Nevada, influence the continent's climate and create barriers to the movement of animals which makes for distinct ecological regions on either side.

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