早在1966年，生物学家就要求政府考虑将狼重新引入黄石公园。
As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park.
灰熊、狼、自由放养的美洲野牛和麋鹿群都在公园里生活着。
Grizzly Bears, wolves, and free-ranging herds of bison and elk live in the park.
土狼杀死了公园里大部分的红狐，还赶走了所有的海狸。
The coyotes killed a large percentage of the park's red foxes, and completely drove away the park's beavers.
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