Principal of Competitive Exclusion

The Principal of Competitive Exclusion is the inability of two species with the same described niche to coexist in the same location. Example: The American Grey Squirrel and the Red Squirrel in Britain.  The Red Squirrel was edged out of parts of its fundamental niche after the introduction of the Grey Squirrel (and after that squirrel began to take over some of the Red Squirrel’s resources).

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