The name of the species that eliminated the wolves in Yellowstone so that they had to be reintroduced is <u>humans</u>.
In the olden times, people were unaware about the importance of natural ecosystems and the worth of each organism being part of an ecosystem. An expansion in an area caused the wild predators to come close to domestic livestock during the 1800's. The wolves began using these domestic animals as a source of nutrition. The humans, in order to protect their livestock, killed wolves.
It was as late as the 1970's when efforts started to being made to protect endangered species. These efforts caused the reintroduction of the wolves in Yellowstone.
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