After years of heated debate, gray wolves were reintroduced to Yellowstone National Park.

经过多年的激烈争论，灰狼被重新引入黄石国家公园。

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Gray wolves are their ancestors.

灰狼是狗的祖先。

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What are the main differences between red wolves and gray wolves?

红狼和灰狼的嘴拙要区别是什么？

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He saw the rushing forms of the gray wolves, their shinning eyes, their long wet tongues and sharp teeth.

VOA: special.2010.02.27

Estuaries and rocky beaches are "guarded" by brown and black bears, gray wolves and cougars.

CNN: 10 of the world's last great wilderness areas

Gray wolves will continue to be protected in some areas of the state.

BBC: Wyoming drops federal protection of gray wolves

In 1995, the first batch of gray wolves was reintroduced to Yellowstone National Park as part of a controversial reintroduction program.

CNN: Appeal of wolf removal rescheduled