A sudden decrease in prey populations brought on by the introduction of new predators can diminish the food available to the current inhabitants.
Natural selection is a process in which more environment-adapted organisms tend to survive and reproduce more. A sudden decrease in prey populations brought on by the introduction of new predators can diminish the food available to the current predators. A new species may outcompete a native species after being introduced to an ecosystem.
A few hundred years ago, wealthy folks imported grey squirrels from North America and released them in their yards. The newer, larger grey squirrel couldn't compete with our smaller native red squirrel. Larger size allows grey squirrels to store more fat and endure harder winters. Red squirrel populations and habitats have so drastically declined.
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